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APA Gen 4 Littel Bastard/ Fat Bastard

I disagree. There are significant differences between brakes. You can really see the difference shooting off props on the clock.
Generally yes. But if you start looking at designs, there are a few that look pretty similar. Example. SRS Ti Pro 5 and the Fat Bastard. Same but different. Eye balling all the port angles look the same. How much more can that specific design be improved upon?

PortaJohn

ASGH

Literally NO ONE cares.
Heard about one of these places shot up or bummbed anymore? No one cares.
I won't say no one cares. Conservative will be horrified BUT tend to stick with the letter of the law. IF Conservatives played by the real rules every one of these butcher shops would be burnt to the ground.

Continuous scope ring slippage

I've had this issue, albeit on a .22. Still, trying to shim the sides of the rail is going to be an exercise in patience, if not futility. Just cut an aluminum strip out of a coke can and put it between the bottom of the rings and the top of the rail. If you don't want to use a coke can, you can get strips of stainless shim material from Amazon.
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Proof Research 223 Wylde Muzzle Threads

Someone once shared this. I found it fascinating.
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I saw that video as well. I remember running across a torque spec, some time ago, for muzzle devices. I suppose that most use crush washers for muzzle devices, so it wasn't a common question or a big issue. Since silencers have become so much more common, I'm starting to see the question of muzzle device torque pop up more often. If I recall, the spec calls for 20-30 ft-lbs regardless of thread size, which I found odd. You would think that the larger thread would take more torque.

Anyway, surefire needs to get with the times and get into some HUB compatibility.

M40A1 USMC spec clip slot drawing.

Hi all, i’m a rifle builder from the UK and i’ve been tasked with adding the clip/lug slot features and thumb slot on some E serial number actions. I’
not sure how accurate the builds will be but i’d like to get my part as accurate as possible.
While we are on the subject, I"ll quickly share a odd little variance on a real USMC E-prefix M40A1 - note the crude/hand-inscribed "US" above the serial number...I have seen this more on the 1992 era C-prefix M700s, but I guess a 2112 decided to inscribe that "US" on this particular E-prefix rifle. I don't recommend you do that, but just an observation about these rifles. It has the 'RTE-P' proof stamp on the barrel, which is something clone builders often do on these retro builds to make them look more "correct".
M40A1_E-prefix_637_arrow.jpg


This E-prefix had the later "PWS-P" stamp, and also the barrel install date stamped on the left side (month + 2 digit year). This rifle did not have the "US" hand engraved, so lot of small variances were seen...even black buttpads on a few M40A1 stocks. Anyhow, this was a VERY late M40A1, as I recall the barrel date year was "00" or "01" (2000 or 2001), and it had a US Optics ("USO") made scope, which were replacement scopes for the small number of Unertls scopes that were not-repairable. I recall that contract award to US Optics was back in 2000, so this M40A1 was likely one of the last M40A1 builds before PWS re-built them into the M40A3 configuration.
Real_M40A1_E-prefix_USO_scope_arrows.jpg

...Perhaps the funniest variance that I saw on real M40A1s was a rifle with a "--SUPER GRADE--" M70 bottom metal. I guess pre-64 bottom metal was hard to find, and a 2112 used whatever was available, including what was once a highly polished magazine plate on a high-end Winchester Model 70 hunting rifle...but I digress.
Quantico_M40A1s_May_2017_SuperGrade_v2.jpg