Recent content by Henryrifle

@357Max: I appreciate all the effort and detail you put into that response and I know others do and will as time goes by. It deserves a proper response from me. I am going to answer the easier questions you have posed here but will need a week or two to answer the more involved questions as...

Thank you, Bill. Hugely (Bigly) helpful! Thank you for reading all the detail and incorporating into your responses. I am learning a lot in this thread and very much appreciate the knowledge shared! It sounds like I am doing a lot of things wrong that potentially compromise the optimum...

Glad I don't have one of those screwed up barrels! Hank

@Dino11: How do you interpret that? Given the popularity of the 6.5 Grendel in the AR platform, surely Lapua made their brass with semi-autos in mind? I'd be tempted to think their brass is made for bolt guns but that doesn't really make sense in this use case. Hank

I messed around with a heavier buffer before when trying to suppress a LMT 308. That along with an adjustable gas key made it work but the forward momentum of the heavier buffer was very noticeable and I'll admit that I am much better bolt gun driver than AR driver. All that said, I like your...

@Evintos: The SA AGB is the kind that bleeds off pressure and, if you can gauge over/under gassed by ejection pattern mine is throwing brass out between 4:30 and 5:30. I was shooting from prone and the brass was within arms reach so, 2' or so away. I have not changed the adjustment from when...

I am not really a velocity chaser either but hate to run the projectile 200 FPS slow just because my rifle is set up wrong. Also, today destroying brass puts you at risk of not being able to replace it. This whole project for me has been just that, a project. There is still dykem blue just...

Am I barking up the wrong tree or worth a try? Hank

@Evintos: Thank you for expanding my understanding by at least 100000%. Will read through that a few more times to let it sink in. Thanks also to @LRRPF52 for a similar explanation. It sounds like the unlock start time is driven by gas port location and the unlock speed is driven by...

If I am understanding y’all, the unlock time, early or late, is established primarily by the gas system length relative to barrel length (really how muck longer the bullet will be on the barrel after passing the gas port) but the ejection pattern is driven more by pressure and volume of gas...

Update from further testing. I wonder if there is a clue in this: I loaded 5 rounds with 1.2 less grains of Lever. So, 28.2 VS. 29.4. Everything else is was the same including outside air temperature. Average velocity down from 2740 to 2644 FPS. Cases ejected between 4:00 and 5:00 o'clock...

I have been shooting a 6mm ARC on and off for the past year or so. I profiled and chambered the barrel (22” Wilson w/rifle length gas), installed the extension and threaded the muzzle. The rest of the parts are reasonable quality parts and appropriate to the build. MUR Vltor upper and lower...

I am looking for a thread that would help all of us understand more about AR-15 operation especially when ‘problems’ are encountered. We’ve all seen the ejection angle chart and perhaps the resolution steps outlined in that chart, AGB, lighter or heavier buffer and/or buffer spring and gas...

Got a chance to shoot with the OSS today. I had already shot several groups with a bolt gun and admitting that I am not the best AR trigger puller may have even been a little worse than usual due to the differences between a competition rifle and my 6mm ARC AR. I was also using year old hand...