While I do not have any advice on your build, we have lots of knowledgeable members here that should be able to point you in the right direction. Welcome to the forum!
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Slide removal problems.
I've done stupid things before and will undoubtedly do more of them in the future...
I have been "assembling" a P320 full size from parts. FCU is 80% build, lower parts kit from USPatriotArmory, grip is Sig X-series full, slide is from GreyGhost, slide completion parts (Recoil Spring, Extractor, Extractor Pin, Extractor Spring, Stricker Assembly) are all Sig, barrel has not been received from GreyGhost.
I finally put the lower parts kit into the FCU, put the FCU into the Grip Module (with Takedown Lever) following the video from The Rogue Banshee (only instructions I could find for assembling the FCU). I could not resist putting the stripped Slide on the Grip Module with FCU inserted to see how it looked. I have not put the parts into the Slide at this point. The Slide moved nicely and seemed like everything fit. Then I tried to remove the Slide. Moved the Slide back. Locked the Slide in place. Rotated the Takedown Lever clockwise to 6:35. Slide won't budge forward. It's locked.
Removed the Slide Takedown Lever. Removed the Slide and FCU from the Grip Module. Noticed that the Disconnector is in the up position locking the slide. Manually depressed the Trigger Bar, the Disconnector retracted from the Slide and the Slide slid off the FCU.
I am hesitant to go any further with this build until I understand if there is something wrong with my FCU build or if this is normal behavior -- will it rectify itself when I complete the slide (how much of this can I do while waiting for a barrel).
I further noticed that the Lever Takedown Safety sticks in the rear position. It was forward when I inserted the Takedown Lever, but now does not seem to want to move (the Takedown Lever rotates just fine).
I have searched the forums, I have used DuckDuckGo to search for other posts, to try to understand where I have gone wrong. Any suggestions / help would be appreciated. I do not object to people laughing at my newby mistakes.
I have been "assembling" a P320 full size from parts. FCU is 80% build, lower parts kit from USPatriotArmory, grip is Sig X-series full, slide is from GreyGhost, slide completion parts (Recoil Spring, Extractor, Extractor Pin, Extractor Spring, Stricker Assembly) are all Sig, barrel has not been received from GreyGhost.
I finally put the lower parts kit into the FCU, put the FCU into the Grip Module (with Takedown Lever) following the video from The Rogue Banshee (only instructions I could find for assembling the FCU). I could not resist putting the stripped Slide on the Grip Module with FCU inserted to see how it looked. I have not put the parts into the Slide at this point. The Slide moved nicely and seemed like everything fit. Then I tried to remove the Slide. Moved the Slide back. Locked the Slide in place. Rotated the Takedown Lever clockwise to 6:35. Slide won't budge forward. It's locked.
Removed the Slide Takedown Lever. Removed the Slide and FCU from the Grip Module. Noticed that the Disconnector is in the up position locking the slide. Manually depressed the Trigger Bar, the Disconnector retracted from the Slide and the Slide slid off the FCU.
I am hesitant to go any further with this build until I understand if there is something wrong with my FCU build or if this is normal behavior -- will it rectify itself when I complete the slide (how much of this can I do while waiting for a barrel).
I further noticed that the Lever Takedown Safety sticks in the rear position. It was forward when I inserted the Takedown Lever, but now does not seem to want to move (the Takedown Lever rotates just fine).
I have searched the forums, I have used DuckDuckGo to search for other posts, to try to understand where I have gone wrong. Any suggestions / help would be appreciated. I do not object to people laughing at my newby mistakes.
1 - 20 of 21 Posts
Thank you Multisync. I am sure that I will learn most by listening to those that have trodden this way before...While I do not have any advice on your build, we have lots of knowledgeable members here that should be able to point you in the right direction. Welcome to the forum!
Welcome from Tennessee and there will be some come along very soon who can help you with your problem.
I grew up in Nashville. I miss the green hills of Tennessee.Welcome from Tennessee and there will be some come along very soon who can help you with your problem.
I am near the Tri-Cities area of Kingsport, Bristol and Johnson City. I was in Nashville 2 times last month. A beautiful drive!
Well, something's not right.
Sig Mechanics published a series of videos on the 320 detailing how everything works. You should watch them and see if you can deduce what's wrong.
Pay attention to the part where the takedown safety lever is inserted into the FCU in front of the spring in the sear housing and the spring isn't bent.
I would also carefully inspect the fcu chassis to make sure you didn't overlook any burrs, ensure the holes are located correctly and the rails are bent over and trimmed correctly.
Sig Mechanics published a series of videos on the 320 detailing how everything works. You should watch them and see if you can deduce what's wrong.
Pay attention to the part where the takedown safety lever is inserted into the FCU in front of the spring in the sear housing and the spring isn't bent.
I would also carefully inspect the fcu chassis to make sure you didn't overlook any burrs, ensure the holes are located correctly and the rails are bent over and trimmed correctly.
Welcome to the forum. Based on what you are saying, it sounds like normal behavior. I'm guessing the disconnector locked up in the channel on the slide where the slide cap would be installed. When you get your slide assembled with parts, this shouldn't be a problem. The disconnector normally has upward tension.Removed the Slide Takedown Lever. Removed the Slide and FCU from the Grip Module. Noticed that the Disconnector is in the up position locking the slide. Manually depressed the Trigger Bar, the Disconnector retracted from the Slide and the Slide slid off the FCU.
Part of the function of the takedown safety lever is to lock into the rear position with the slide catch lever. This is initially started when the takedown lever is installed and rotated to the 6-6:30 position. Lifting up the slide catch when the takedown lever is in the normal 3'o'clock position would release the lever and allow it back in the forward position. This is part of Sig's three-point safety mechanism that prevents disassembly of the firearm with a magazine installed.I further noticed that the Lever Takedown Safety sticks in the rear position. It was forward when I inserted the Takedown Lever, but now does not seem to want to move (the Takedown Lever rotates just fine).
Like @saudadeii mentioned, I also recommend SIG Mechanics youtube channel that have very helpful videos. Some specifics are the P320 - Safety Mechanism and the P320 FCU - Textbook Teardown. Good luck with your build!
Thank you for reply. Give me confidence I haven’t messed up too much yet. Watched Sig Mechanics Safety Mechanisms video just after he was recommended. Wow! I learned a lot about the FCU operation I did not know. I also disassembled FCU and did some polishing of drill holes that still seemed a little rough. However still not happy with the FCU.
Disengage the sear from the striker manuallly. See Sig Mechanic videos for several methods to accomplish.
Welcome to the forum. Based on what you are saying, it sounds like normal behavior. I'm guessing the disconnector locked up in the channel on the slide where the slide cap would be installed. When you get your slide assembled with parts, this shouldn't be a problem. The disconnector normally has upward tension.
Part of the function of the takedown safety lever is to lock into the rear position with the slide catch lever. This is initially started when the takedown lever is installed and rotated to the 6-6:30 position. Lifting up the slide catch when the takedown lever is in the normal 3'o'clock position would release the lever and allow it back in the forward position. This is part of Sig's three-point safety mechanism that prevents disassembly of the firearm with a magazine installed.
Like @saudadeii mentioned, I also recommend SIG Mechanics youtube channel that have very helpful videos. Some specifics are the P320 - Safety Mechanism and the P320 FCU - Textbook Teardown. Good luck with your build!
In rechecking my work, I found some burs & polished them out. When I compared operation of my takedown safety lever to that of Sig Mechanic I’m still not happy with it. There is resistance and click to move it back into forward position. Think I’m going to work on second FCU with a Sig LPK and see if I get different result.Well, something's not right.
Sig Mechanics published a series of videos on the 320 detailing how everything works. You should watch them and see if you can deduce what's wrong.
Pay attention to the part where the takedown safety lever is inserted into the FCU in front of the spring in the sear housing and the spring isn't bent.
I would also carefully inspect the fcu chassis to make sure you didn't overlook any burrs, ensure the holes are located correctly and the rails are bent over and trimmed correctly.
Tried that there was no joy. The disconnector remained hung.Disengage the sear from the striker manuallly. See Sig Mechanic videos for several methods to accomplish.
If its far enough backvHave you thought of removing the backplate, the striker and then the extractor spring. Might then be able to disengage the extractor. If the slide isn't loose you can then take a rubber mallet and lightly tap the slide back without the striker in.
I had not installed backplate, striker or extractor. It was just the stripped slide.If its far enough backvHave you thought of removing the backplate, the striker and then the extractor spring. Might then be able to disengage the extractor. If the slide isn't loose you can then take a rubber mallet and lightly tap the slide back without the striker in.
Posted this on wrong thing then. Saw someone post somewhere earlier where got round stuck in chamber and slide partially open and slude wouldn't move. Thought I was replying to that. Can't remember if that was on here or reddit.I had not installed backplate, striker or extractor. It was just the stripped slide.
If I didn’t make mistakes, I would not have posted in this forum. Hope whoever posted in that thread finds a resolution to their problem.
In my experience building from 80% fcu's there is going to be quite a bit of final fitting and polishijg to get everything nice and smooth and functioning 100%
Often there will be a breakin period with the slide and fcu as well.
Often there will be a breakin period with the slide and fcu as well.
Before I messed up the first FCU re-polishing the drill holes, I could not get the "Lever, Takedown Safety" to move smoothly when inserted. I don't know if the part was out of spec, if I had mangled the spring in the Sear Housing Assembly, or it was not mating properly with the Sear. At the stage when the (using SigSauer nomenclature) "Sear Housing Assembly" w/ "Disconnector", "Lever, Safety," "Sear" with springs, and "Lever, Takedown Safety, "were inserted into the FCU with the various pins, the "Lever, Takedown Safety" moved smoothly backward and forward. Once the "Trigger" and "Triggerbar" were installed, it did not move as freely -- it hung in the rear position and when pushed forward I could hear a click. Futhermore, when I looked into the FCU from the top, I did not see the Sear move when I moved the "Lever, Takedown Safety" (as I understood it would move).
Finished a second 80% FCU that I have. Spent much longer polishing out the drill holes and other cuts necessary to finish the FCU. I used Dremel Aluminum Oxide wheels to remove the burs from the holes wherever possible, going so far as inserting the bit into the interior of the FCU with the shaft protruding from the hole in the opposite side of the FCU, then attaching the Dremel to the shaft. The technique was time consuming, but it resulted in an FCU with a very smooth finish. Then I used a 2" diameter by 1/4" thick rubber sanding wheel with 3000 and then 5000 grit sandpaper attached with a handheld drill to continue the polishing. The result was an FCU with no detectable (by me) burs, just nice clean holes.
I inserted the parts from a second LPK into this FCU. Everything moves as it should. The "Lever, Takedown Safety" moves to the rear when the Takedown Lever is rotated to 6:35 and returns to its forward position when the Takedown Lever is returned to normal position.
I now have much more faith that I have assembled this FCU properly. However, I am hesitant to insert it into a grip module and mount the slide on top. Maybe just a tad "gun shy" (sorry for that).
Once I insert all the parts into the slide, I guess I will have to mount the slide on top to see the result.
More later.
I inserted the parts from a second LPK into this FCU. Everything moves as it should. The "Lever, Takedown Safety" moves to the rear when the Takedown Lever is rotated to 6:35 and returns to its forward position when the Takedown Lever is returned to normal position.
I now have much more faith that I have assembled this FCU properly. However, I am hesitant to insert it into a grip module and mount the slide on top. Maybe just a tad "gun shy" (sorry for that).
Once I insert all the parts into the slide, I guess I will have to mount the slide on top to see the result.
More later.
pics would help.I've done stupid things before and will undoubtedly do more of them in the future...
I have been "assembling" a P320 full size from parts. FCU is 80% build, lower parts kit from USPatriotArmory, grip is Sig X-series full, slide is from GreyGhost, slide completion parts (Recoil Spring, Extractor, Extractor Pin, Extractor Spring, Stricker Assembly) are all Sig, barrel has not been received from GreyGhost.
I finally put the lower parts kit into the FCU, put the FCU into the Grip Module (with Takedown Lever) following the video from The Rogue Banshee (only instructions I could find for assembling the FCU). I could not resist putting the stripped Slide on the Grip Module with FCU inserted to see how it looked. I have not put the parts into the Slide at this point. The Slide moved nicely and seemed like everything fit. Then I tried to remove the Slide. Moved the Slide back. Locked the Slide in place. Rotated the Takedown Lever clockwise to 6:35. Slide won't budge forward. It's locked.
Removed the Slide Takedown Lever. Removed the Slide and FCU from the Grip Module. Noticed that the Disconnector is in the up position locking the slide. Manually depressed the Trigger Bar, the Disconnector retracted from the Slide and the Slide slid off the FCU.
I am hesitant to go any further with this build until I understand if there is something wrong with my FCU build or if this is normal behavior -- will it rectify itself when I complete the slide (how much of this can I do while waiting for a barrel).
I further noticed that the Lever Takedown Safety sticks in the rear position. It was forward when I inserted the Takedown Lever, but now does not seem to want to move (the Takedown Lever rotates just fine).
I have searched the forums, I have used DuckDuckGo to search for other posts, to try to understand where I have gone wrong. Any suggestions / help would be appreciated. I do not object to people laughing at my newby mistakes.
we've seen folks who had pins in backwards, pins missing, etc. can only be discerned by careful inspection of clear detailed pics.
of FCU, both sides, top, bottom, you can put tape where the SN is, should be, whatever.
1 - 20 of 21 Posts
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