Try pulling the safety then installing the hammer. Reinstall the safety with the hammer locked down
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Thanks for the reply. To answer a couple of your questions-Welcome to the forum!
I've installed many triggers and reinstalled SIG safety selectors in MCXs and your situation is unique in my experience. The MCX may not like your Radian Talon safety selector, i.e., it may not be a good fit.
In the Virtus class of MCXs, SIG used what might be described as an accu-wedge that keeps tension between the upper and lower. The wedge is black rubber and is easier to see when the rear take down pin is pushed out. It may be in the way or be holding debris in the way of the safety. Observe the operation of the safety and trigger with the upper separated. Catch the hammer as it falls to avoid damage to the lower. The wedge can be manually removed with a needle nose pliars. It can be re-contoured with a sharp knife and reinserted.
When the grip on the MCX is off, both the safety detent with spring and rear take down pin detent with spring are loose. Is everything in place?
Now that I know what it looks like I will check it out and report back-https://www.sigsauer.com/sig-sauer-small-parts-shoppers/mcx-parts-picker?location=Wedge
Correct. 2 different Radians, 1 Ambi and 1 single side. Both ran with no issuesYou had the Talon in before?
Ok, also make sure the trigger spring's legs are pointing forward. It's not unusual for this spring to slip off before install, an if the spring is flipped and installed with legs pointing rearward the rear of the trigger assembly will be lifted and the safety interferes with trigger function.Thanks for both replies. I have tried every combo of installing that I can think of. I am going to try calling Sig this morning and see what they say. The legs are on top of the trigger pin and oriented the proper way. Also doubled checked the following-
Correct pins with the trigger and hammer. No obstructions in the lower. My pistol grip bolt is plenty short and not pushing into the lower.
Like I said before everything functioned before I messed with it, and everything looks good until I install the hammer. It just seems like the pressure of the hammer is pushing the back end of the trigger ( closest to the stock) up a tiny hair and is hitting the bottom of the safety selector when it rotates. I searched everywhere and cannot find anyone having this issue except one comment on a AR video on youtube. If I don't get direction from Sig I am going to start fresh tonight. Strip everything off. Install trigger first, then hammer, lock it down, then safety if the hole for the safety is not obstructed by the back piece of the trigger.
And yes both thumbs and index fingers are smoked. I have a pistol class on Saturday, should be interesting. I am never going to swap or remove the trigger again
Thanks again for the responses and if anyone else has any thoughts it is greatly appreciated.
Bill,SIG MCX safeties don't use a positioning ring on the left side looking forward. The SIG M400 and 516 have such a positioning ring. I forgot that on a 516 lower that I built using an MCX parts kit on a stripped AR lower. The lack of the positioning ring caused minor cosmetic damage on the outside of the receiver on the left side looking forward. Use of such a positioning ring on an MCX might cause the damage that I see by mispositioning the safety.
The simple solution is to reinstall the SIG safety designed for the MCX. I hope you have a good roll pin punch set, starter punch and pin. Start the rolll pin on the right side from the bottom so as not to ding the lip on top of the lower. I predict your problem will disappear after the SIG safety is reinstalled. Alternatively if there is a positioning ring, just don't use it and see how she functions. But the safe thing to do is to reinstall the SIG safety.
Picture of SIG safety with positioning ring NOT used on the MCX: www.midwestgunworks.com/page/mgwi/prod/amb-safe-516-716-m400
I did try both ways. The main issue is I cannot get any safety into the hole after I install the hammer. I personally do not think it will matter which safety is in there. I started with the factory, then ran a radian ambi, then a radian single sided. All 3 operated with no issues, Something is going on with the trigger and hammer install. I am not sure if I am doing something wrong but everything looks ok to me. I just don't know.This is a picture of a SIG 516 build with an MCX safety instead of the discontinued M400/516 parts kit. It functions perfectly, but the correct safety would have prevented the tiny amount of cosmetic damage with use of the spacer ring in the 516 kit. (I use the left over bumper in the MCX kit as a spare for my 5 MCXs.)
The cosmetic damage is the silver quarter circle at the tip of the safety.
Bill View attachment 460160
PS Alternative theory- Your safety is both 45 and 90 degree capable. Did you switch from one to the other? B
Thanks for the pic. Is the safety installed, but out of the frame? The pics’ angle not sure if the safety’s installed.