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Question on Sig P320 X Compact Optic

1290 Views 24 Replies 10 Participants Last post by Jackal, 11 mo ago

oldfrank

Discussion Starter · 11 mo ago

After carrying my Sig P365 since it first came out I have finally decided to add my 2nd Sig.
I just ordered a Sig P320 X Compact.
I would prefer not to buy a Romeo Optic for it since I have a new Swampfox Justice already and it is one of my favorite optics.
It used RMR,Holosun footprint.
I think I heard newer P320's have RMR holes so perhaps I can direct mount my optic which would be sweet.

I am not above using a plate if I have to, I have owned and shot several Glocks with MOS plates and the little extra height never bothered me.
Is it true about the RMR holes! It will probably be a week or so before I pick the 320 up at my FFL.

Thanks!

1 - 20 of 25 Posts

TMC365

· #2 · 11 mo ago

Yes, newer slides have the RMR pattern Holes but you will need the C&H Precision plate for it to work best.

Reactions: 1

jazzman001

· #3 · 11 mo ago

You can also look at a Bobro Engineering adapter plate that come's with a built-in rear sight.

Reactions: 1

Bad Bob

· #4 · 11 mo ago

Or just order some 6-40 3/8" screws from Brownells and mount it to the slide. You may need to trim the screws a bit.

oldfrank

Discussion Starter · #5 · 11 mo ago

Bad Bob said:
Or just order some 6-40 3/8" screws from Brownells and mount it to the slide. You may need to trim the screws a bit.

If it is possible to mount my optic right to the slide what is the purpose of the plates?
To fill the gaps and make it more secure?

Jackal

· #6 · 11 mo ago

oldfrank said:
If it is possible to mount my optic right to the slide what is the purpose of the plates?
To fill the gaps and make it more secure?

That and the added recoil bosses take the force off of the mounting screws.

Jackal

· #7 · 11 mo ago

2

If you have this cover with the rear sight built in:

Air gun Trigger Gun barrel Gun accessory Metal

You can either get the BoBro plate (aluminum and about $100, has built in rear sight, non adjustable), or you can get the Forward Control Designs plate (steel, about $78, you can purchase a rear sight from them that works with the plate and you can have it adjusted).

Stay away from the CHPWS plate as it has had issues with QC.

Pictured below is the FCD plate:

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oldfrank

Discussion Starter · #8 · 11 mo ago

Thanks everyone for all the helpful answers. I understand it a lot better now.
I am deciding either to buy the plate or to bite the bullet and buy the Romeo 1 Pro and use my Swampfox on something else.
I will decide when I have the P320 in my hand and maybe that will help me decide.
I have one Glock that has been cur for an optic and had one that is MOS. The MOS sat a bit higher but it never really bothered me so that adds to the decision.

Bad Bob

· #9 · 11 mo ago

oldfrank said:
If it is possible to mount my optic right to the slide what is the purpose of the plates?
To fill the gaps and make it more secure?

To fill the gaps.

Hambone1

· #10 · 11 mo ago

All you need to run an RMR on a slide cut for a Romeo/DPP is to have the holes drilled for the screws. Then you do not need a stupid failure prone plate.
Impact Machine does an excellent turn around service, I know from experience.

Bad Bob

· #11 · 11 mo ago

Jackal said:
That and the added recoil bosses take the force off of the mounting screws.

The plate is held on by 2 screws. The optic is held to the plate with 2 screws. It still comes down to two 6-32 or 6-40 machine screws depending on the application.
Looking at the weight of the optic and the tensile strength of quality fasteners, unless damaged by over torqueing you have nothing to worry about.

McMaster-Carr

McMaster-Carr is the complete source for your plant with over 595,000 products. 98% of products ordered ship from stock and deliver same or next day.

www.mcmaster.com

Bad Bob

· #12 · 11 mo ago

Hambone1 said:
All you need to run an RMR on a slide cut for a Romeo/DPP is to have the holes drilled for the screws. Then you do not need a stupid failure prone plate.
Impact Machine does an excellent turn around service, I know from experience.

Current production slides have RMR pattern threaded holes as well, but the are not 6-32 they are 6-40.

Reactions: 1

TacoJoe

· #13 · 11 mo ago

oldfrank said:
Thanks everyone for all the helpful answers. I understand it a lot better now.
I am deciding either to buy the plate or to bite the bullet and buy the Romeo 1 Pro and use my Swampfox on something else.
I will decide when I have the P320 in my hand and maybe that will help me decide.
I have one Glock that has been cur for an optic and had one that is MOS. The MOS sat a bit higher but it never really bothered me so that adds to the decision.

I have the Romeo One Pro directly mounted to my P320 XCompact slide and love it. Works great no plates. Looks clean.

Jackal

· #14 · 11 mo ago

Bad Bob said:
The plate is held on by 2 screws. The optic is held to the plate with 2 screws. It still comes down to two 6-32 or 6-40 machine screws depending on the application.
Looking at the weight of the optic and the tensile strength of quality fasteners, unless damaged by over torqueing you have nothing to worry about.

McMaster-Carr

McMaster-Carr is the complete source for your plant with over 595,000 products. 98% of products ordered ship from stock and deliver same or next day.

www.mcmaster.com

Plates when properly designed will not put lateral recoil forces on the screws...

That is the job of the lugs/recoil bosses (plate to slide and MRDS to plate).

Reactions: 1

Pete K

· #15 · 11 mo ago

oldfrank said:
Thanks everyone for all the helpful answers. I understand it a lot better now.
I am deciding either to buy the plate or to bite the bullet and buy the Romeo 1 Pro and use my Swampfox on something else.
I will decide when I have the P320 in my hand and maybe that will help me decide.
I have one Glock that has been cur for an optic and had one that is MOS. The MOS sat a bit higher but it never really bothered me so that adds to the decision.

You have a lot of options out there.
What I do is first determine the optic I believe will have the best durability, features, benefits, warranties, etc.
Then I determine what way I want to go regarding mounting, plates, etc. This is especially true if I plan to use it as a self defense tool vs range toy.

Superzuki

· #16 · 11 mo ago

I used a Romeo One Pro on my X-Compact. It works fine.

Plant Light Leaf Wood Grass

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Reactions: 1

Bad Bob

· #17 · 11 mo ago

Jackal said:
Plates when properly designed will not put lateral recoil forces on the screws...

That is the job of the lugs/recoil bosses (plate to slide and MRDS to plate).

Correct, however, It should not be a problem with quality fasteners.
Did you look at the link? The fasteners have a tensile strength of 139,000 PSI. You could use your optic as a hammer. That being said the plates offer redundancy if that is something that appeals to you and raises the optic. I also understand that RMR's need a sealing plate.

ptco911

· #18 · 11 mo ago

I have the first generation X Compact slide and use the Romeo 1 Pro on it.

Reactions: 1

Jackal

· #19 · 11 mo ago (Edited)

Bad Bob said:
Correct, however, It should not be a problem with quality fasteners.
Did you look at the link? The fasteners have a tensile strength of 139,000 PSI. You could use your optic as a hammer. That being said the plates offer redundancy if that is something that appeals to you and raises the optic. I also understand that RMR's need a sealing plate.

Quality MRDS are not cheap and going the cheap route never works in the end. Buy once, cry once.

If you use the Forward Control Designs plate then you do not need the sealing plate.

The strength of the fastener is through it, not the side of it, in this case holding down the RMR. The strength would be a vertical plane, not a horizontal one.

Bad Bob

· #20 · 11 mo ago

Jackal said:
Quality MRDS are not cheap and going the cheap route never works in the end. Buy once, cry once.

If you use the Forward Control Designs plate then you do not need the sealing plate.

The strength of the fastener is through it, not the side of it, in this case holding down the RMR. The strength would be a vertical plane, not a horizontal one.

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