appreciate the info. i wish they offered the type 2 with a 9 moa dot. i already know the bigger the better and wonder if the 6.5moa is even big enough.
Sidearms & Scatterguns RDS Pistol people, why dont you have a seat right over here......
- Thread starter pmclaine
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appreciate the info. i wish they offered the type 2 with a 9 moa dot. i already know the bigger the better and wonder if the 6.5moa is even big enough.
I carry Holosuns for work. I use em for competition. They’ve been very good for me. I personally don’t care for trijicon which would be the only alternative at this point. The others are have had so many failures that I’ve seen.
Late to the party:
This is the consensus of our local shooting groups. There are some Leupold DPP holdouts--but with carry optics exploding, we've got between 30+ people running SROs and RMRs.
I was a skeptic for a long time. I was wrong--if you are a Boomer carrying 1911 guy, get your ass a Red Dot. And unlike your rifle, make it a BIG dot. I'm too fat and slow to be GM level--but its what all our pros use (the sponsered guys)
99.99999% of USPSA shooters wearing jerseys with "sponsor" logos aren't even close to being professional shooters by any definition of the word..... LOL
Recently purchased a Walther PDP compact and was going to give the red dot thing a go. Anyone have any experience with the US Optics DRS 2.0 Enhanced?
www.usoptics.com
DRS 2.0 Enhanced - US Optics
When looking for a reflex sighting solution for your duty pistol, shotgun or AR, you’re looking to achieve one goal – to always be ready. The DRS 2.0 Enhanced will undoubtably help you find your target fast and take the shot accurately.
www.usoptics.com
I’m kind of waiting on the P2 as well, but something says I’ll be waiting awhile and should just get an RMR for now.
Besides, I already sold an SRO because duty grade retention holsters for the Langdon 92G LTT RDO are hard enough to find before you even bring the SRO’s increased size into the equation. I’d imagine waiting for an ACRO P2 holster will take even longer. So while that’s the end goal for me, I’ll probably cave on an RM06 soon and run that until everything else comes together for the P2.
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How many inch pounds of screw stretch are you RMR/Sig people using to mount your sights.
Took a class this week, two days of firing, less than 500 rounds. Looks like my witness marks walked a little.
Gonna clean, dry thread, apply some blue loctite and snug them back up.
Seeing everything from 9 to 12 inch pounds.
DO NOT WANT TO SNAP A SCREW.
Paging @308pirate as he is the last word on everything
Took a class this week, two days of firing, less than 500 rounds. Looks like my witness marks walked a little.
Gonna clean, dry thread, apply some blue loctite and snug them back up.
Seeing everything from 9 to 12 inch pounds.
DO NOT WANT TO SNAP A SCREW.
Paging @308pirate as he is the last word on everything
Yep. Blue loctite.
I also use oil base paint to seal the head of the screw and hit it with an oil base paint witness mark
I set them at 12 inch pounds using a Seekonk beam wrench Ill paint them up and watch the marks.
How many inch pounds of screw stretch are you RMR/Sig people using to mount your sights.
Took a class this week, two days of firing, less than 500 rounds. Looks like my witness marks walked a little.
Gonna clean, dry thread, apply some blue loctite and snug them back up.
Seeing everything from 9 to 12 inch pounds.
DO NOT WANT TO SNAP A SCREW.
Paging @308pirate as he is the last word on everything
15 in-lb + Blue Loctite 242 is what I've used with success on both 6-40 and 6-48 screws into stainless slides with adequate engagement. Different materials and/or thread engagement may dictate lower values.
Per Sig instructions for the Romeo Pro …
“Direct Mount: The ROMEO1PRO, when mounted directly to a firearm only requires two mounting screws. The mounting holes should be checked for debris and cleaned out if necessary. The sight is to be placed directly on the slide and inside of the shroud if applicable, the screws threaded
into the proper holes in the firearm, and the fasteners torqued to 28-30 in-lbs. Mounting screw torque should be checked approximately every 500 rounds, or any time the optic is removed and reinstalled. Proper mounting torque is critical to ensuring the optic zero does not shift under recoil.”
“Direct Mount: The ROMEO1PRO, when mounted directly to a firearm only requires two mounting screws. The mounting holes should be checked for debris and cleaned out if necessary. The sight is to be placed directly on the slide and inside of the shroud if applicable, the screws threaded
into the proper holes in the firearm, and the fasteners torqued to 28-30 in-lbs. Mounting screw torque should be checked approximately every 500 rounds, or any time the optic is removed and reinstalled. Proper mounting torque is critical to ensuring the optic zero does not shift under recoil.”
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How many inch pounds of screw stretch are you RMR/Sig people using to mount your sights.
Took a class this week, two days of firing, less than 500 rounds. Looks like my witness marks walked a little.
Gonna clean, dry thread, apply some blue loctite and snug them back up.
Seeing everything from 9 to 12 inch pounds.
DO NOT WANT TO SNAP A SCREW.
Paging @308pirate as he is the last word on everything
I go by the Fastenal guide for screw torques in the absence of a specific manufacturer's standard.
I would need to know the exact thread specs we're talking about.
Trijicon optics use #6 32 TPI flat head screws, and I always buy them from McMaster Carr so I know they comply with ASTM F835 for alloy composition and mechanical properties: https://www.mcmaster.com/screws/fla...ex-drive-flat-head-screws-9/thread-size~6-32/
In my case, going by the Fastenal guidlines, I torque my screws to between 15 and 17 in-lb on my pistols that are either direct mill or use the OEM CZ optics adapter plate, which use #6-32 screws.
I have one P-10C that has a CHPWS optic plate. That one uses machined bosses and smaller #4-40 flat head screws. Those I torque to 9 - 10 in-lbs, again referencing the Fastenal guide.
Holy shit that's a lot unless they're pretty big fucking screws........
That's too low for what I assume are #6 flat head screws threaded into steel and VC3 sucks balls.
I don't care who FCD is, there's no way I would follow their recommendation.
I'm almost sure it's some far east cheapo. Consider it disposable or buy two if they're cheap enough. That way you have a spare for when, not if, the other breaks.Recently purchased a Walther PDP compact and was going to give the red dot thing a go. Anyone have any experience with the US Optics DRS 2.0 Enhanced?
DRS 2.0 Enhanced - US Optics
When looking for a reflex sighting solution for your duty pistol, shotgun or AR, you’re looking to achieve one goal – to always be ready. The DRS 2.0 Enhanced will undoubtably help you find your target fast and take the shot accurately.
Or buy a Trijicon which you know will work and have resale value in case you don't like it.
I think I see what a part of your problem is. Those are button head screws and you need to use flat head (countersink) screws. Flat head screws will have tons more contact area (friction)under the head.
The 2/32 MOA Holosun reticle is perfect on a shotgun. 5 or 6 MOA dot is perfect on a handgun.
No these have a countersunk head....
SIG P320 6-40 LowProfile Head Screws for Trijicon RMR / SRO - C&H Precision Weapons
These screws were designed and manufactured by C&H Precision to mount the Trijicon RMR & SRO to the SIG P320 OEM Romeo1 Pro Optics Cut with RMR 6-40 mounting holes. These come as a set of two. These screws are meant to be used with one of following C&H Precision…
chpws.com
Wish I had a good spec on what the tap is on the AXG slide. Assuming 6-40 x .41. Also see that they may be M40 - .7.
Im just kind of trusting CPHWS based on what they sent with teh plate but that may not be advisable.
From Sig
From a customer at CPHWS
From Sig Talk....
It is and they aren't. Look like #8s to me but I figure Sig's RDS on Sig's pistol... That's on Sig if something goes wrong. Used the 25 in/lb Fix-it- Stick and rocked on. No issues yet.
Holo-Krome recommends 30 in-lb for UNRC and 34 in-lb for UNRF #6 socket head cap screws (emphasis added since we are almost always using flat-head screws for RDS attachment), and Unbrako recommends 32 in-lb and 40 in-lb. So there is more strength in the threaded portion of even a #6 screw than most people realize, especially when using quality fasteners. (FWIW, Holo-Krome suggests 18 in-lb for a flat head #6 screw - I'm guessing that the smaller hex socket is the limiting factor).
The problem typically comes from the fact that some mounts have about one thread of actual engagement, and so we need to be ever so careful about pulling that out of the butter-soft material used for some slides.
Are there actually mounts with only ~one thread of engagement?? That’s retarded if true, IMO.
I may be exaggerating slightly... but only slightly.
The definition of "enough internal threads" is that I should be able to break the externally-threaded fastener (read: screw) before I strip any internal threads. Many (most?) mounting systems will fail that test. And let's be honest - this isn't limited to just RDS pistol slides (R700 scope rail screws being the example that is probably most familiar to this site's membership).
I just find it hard to swallow that anyone would intentionally design a mount/plate to have only ~1/32” of engagement (assuming a 6-32 screw). I guess it’s possible, but wow.
I currently only have an LTT RDO, but plan to add additional optics to other pistols. By design, the 92 series has to use a plate, but I trust LTT’s plate design more so than I do something like the MOS system. Everything else I own will be milled/direct mount whenever possible as I find it to be a far superior option.
Not mine.....
All my pistols with adapter plates are the CZ OEM system. The plate is steel, it's about 1/8" thick, threaded through, and there are unthreaded recesses in the slide for the screws to keep going.
There are other OEM systems I don't trust (Glock, S&W) because the plate is just a pass through or it's thin as fuck and/or made of aluminum or plastic.
Agree with socked head cap screws having higher standard torque and it has to be due to the larger hex drive in most of them.
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No these have a countersunk head....
SIG P320 6-40 LowProfile Head Screws for Trijicon RMR / SRO - C&H Precision Weapons
These screws were designed and manufactured by C&H Precision to mount the Trijicon RMR & SRO to the SIG P320 OEM Romeo1 Pro Optics Cut with RMR 6-40 mounting holes. These come as a set of two. These screws are meant to be used with one of following C&H Precision…
Wish I had a good spec on what the tap is on the AXG slide. Assuming 6-40 x .41. Also see that they may be M40 - .7.
Im just kind of trusting CPHWS based on what they sent with teh plate but that may not be advisable.
From Sig
View attachment 7780067
From a customer at CPHWS
View attachment 7780068
From Sig Talk....
View attachment 7780069
View attachment 7780070
Gotcha, they appeared to be button head screws from straight above in your picture
Once again, I was being a bit facetious with my comment, but if you take a nominal hole depth and then you take into account all the things which reduce thread engagement (namely the chamfer at the tip of the screw and on the entrance of the internally-threaded hole, and the clearance that needs to remain at the bottom of the hole for the blind drilling and tapping operations), some of these designs leave very, very minimal engagement.
I've got an aftermarket RMR mount on a Ruger Mark III which has just a touch over 2 turns of thread engagement into aluminum. No big deal since it's only a 22LR and the mount doesn't reciprocate, but it's an illustrative example.
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