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Any issues with your gen 4 adjustable gas block? The 7075 aluminum construction has me concerned, not only is it weaker than steel (inch for inch, not lb for lb) but it expands more when heated, figure it would loosen on the barrel after shooting through multiple magazines quickly or deform at...

Awesome! Are the feed ramps polymer or some type of steel?

Is there a feed ramp built into the upper, or a part of the magazine modules? Curious how the bolt and feed geometry is setup to accommodate both single feed and double feed magazines equally reliably.

What’s the reliability like with Glock mags vs scorpion mags?

Is the magazine module made of polymer? Or aluminum?

Any brand of buffer y’all recommend? Or is it not necessary?

I’ve read these are ~1” longer than AC556 springs, is that not true? Either way if it works it works.

I can’t seem to find a replacement AC556 recoil spring, any source for one of those? Which brand of buffer do y’all recommend?

Just picked up an AC556 after a decade or so of wanting one, and am now looking to purchase some replacement parts. I figure I’ll keep an eye out for a parts kit but in the meantime I’m curious if there’s a source for common wear items like recoil springs, buffers, fire control springs, bolt...

China’s Holosun produces most of the components for the Sig Romeo line, including the Romeo 4. They advertise “assembled in USA” but you're really buying a Chinese optic. I’ve used several over the years, they’re nice for what they are, but the whole “assembled in USA” deceptive marketing...

Looks great! How much did that service cost you?

I actually picked up 1,000rds of Speer lawman 147gr and it’s ran flawlessly, have about 200rds left but so far no issues. Don’t think the ones I bought are “clean fire” but I’ll give those a try as well. Appreciate all the suggestions!

I run an Aimpoint T2 with ADM CAS-V mount on my M11/9, perfect height with a Sig minimalist plus stock. Holosun makes decent optics, they’re getting a lot of use over in Ukraine, but they’re Chinese owned and built, personally I’m not a fan of giving them my money.

I paid $11K for one on a form 4 back in February, but it was in excellent condition.

Looking to purchase subsonic 9mm for my M11/9 and GSL Phoenix combo, running a Lage SK upper. I know specialty 158gr rounds exist but from what I’ve seen they’re too expensive to justify buying in bulk over 147gr. Been eyeing Speer Lawman 147gr but not sure how well it’ll run with it’s flat...

Extractor is original to the original bolt, seems to extract snap caps just fine though. Wonder if a new style bolt will eliminate the issue, guess it couldn’t hurt.

Appreciate the info and support folks. It’s a .45, when running the factory MAC suppressor it feeds flawlessly with all of my magazines and any round-nose 230gr FMJ I have on hand. Without the suppressor on it will feed 3-10rds before one is jammed 45 degrees into the chamber with the bullet...

I know these aren’t precision built but a 1.37mm or 0.054” gap seems pretty big, I’m chasing down some FTF issues and was wondering if this slop could be a cause of my issues.

Follow up, on my ‘73 Powder Springs the gap in red is 1.37mm, anyone else willing to measure theirs for me? Just curious if this much of a gap is normal, lots of play between the upper and lower.

My ‘73 M10/45 has a noticeable gap where the rear of the upper meets the lower, allowing the upper to wiggle up and down on the lower. I know some folks use layers of aluminum tape to fix some of this slop but is there a more permanent fix?