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An AR15 upper receiver lapping tool. I ordered one last weekend without reading the small print, turns out I ordered one for AR-10’s instead. This morning I disassembled my .308 and lapped the upper, made a .001 shim to wrap around the barrel extension then thermo fit the barrel to the receiver. After cooling the barrel was rock solid. The AR15 tool is tracking to deliver tomorrow, then I can finish assembly on my latest build…

Are you just counting the peeples that posted on this thread?

Well hell, I went down a rabbit hole reading about this. Apparently there are 7 types.

Glad the S&W AR-10 I got is stamped for both .308 & 7.62 x 51. Takes the guesswork out of it for me! I bought this rifle a few years ago and still have not been out with it. Perils of ageing. Might go on the block soon. Y'all have a wonderful Thanksgiving, Christmas and New Year!!!

Check out her YT showing off at the gym.

Interesting woman, she surfs too… https://www.youtube.com/watch?v=DvM4EmFxMBw

The BATFE needs to drop a couple of letters, since the A and T are regulated by the FDA, and have been for a while now. The B--FE needs to go the way of the dodo bird, since it's now nothing but a political tool for dem control.

So I'll admit here that I've never heard of Sigma. I've only ever heard of Alpha and Beta, and this concept makes so much sense. Super interesting Tom, thanks very much for posting this. I always enjoy learning, and this was a real eye-opener for me.

Welcome from TX. I do however, spend a decent amount of time in your great city as well.

308 and 168 Barnes TTSX are like a light switch you turn it off and poof your animal is dead...I know 8 or 9 elk would vouch for this but they B dead!

I can believe it LOL

Well Done!

You know me too well my good man.

Really, not going to get into a pissing contest. Not worth it. Whatta Hobby!

They were suppose to do a tour with tool, their drummer just up and quit 3-4 weeks ago

Good luck to you. Your M14s and M1As are not the same as AR gas guns with direct impingement operating systems. You might state "Neck tension" and things like that, but that's bolt gun theory, not gas gun theory. You've been lucky thus far - I hope you're still lucky in your future, with all your AR gas guns, and not crimping. Despite your 60 years of reloading. You haven't been reloading AR gas-gun-only for 60 years, I'm certain. That's just not your thing. To everyone else reading this - if you're handloading for AR gas guns, CRIMP your loads to avoid bullet setback, and pressure spikes when they DO setback because they didn't have a crimp on them. "Neck tension" isn't enough - that's bolt gun shiit.

I stick with 0.750" journals anytime I can, unless I MUST go up in journal size, just for a gas port that's needed. Increase journal diameter, decrease gas port diameter. I'll get more into it later...

Shiit starts getting tricky when you're messing around with 16" Rifle Gas - there's not alot of dwell time to play around with... Here's a 22 ARC in that config... 12.5" Midlength Gas is the exact same rodeo - another 22 ARC with 0.750" journal...

That's an impressive amount of research that you did, just to make that post, and I commend you. I'll get my opinion in here either tomorrow or Friday, depending on the time I have. I'll give you the exact port diameter that you'll need for either gas block journal size, man. I base all my 6.5 Creed suggestions from my two 20" Rifle Gas 0.750 journal .260 Rem guns. Same bullet diameter, same exact gas needed. Great job on your recoil system - that's exactly what you need.

I haven't yet, but I'll definitely make it a point to get a pound for testing.

I've gotten myself on a bit of a Primus kick recently.

Good listen, CIA whistle blower of course I can’t find it on YouTube but looks like it’s available everywhere you can listen to podcasts https://open.spotify.com/episode/4Yp2Ey5WDdLqrRngoUmSIP?si=zedK-RrAR2WuPjktkt60TA

Did you ever try Staball Match. I haven’t I’m using up the Varget now going to need to buy some pretty soon

I can’t believe this threads still around and so far off the original post lol

The LR308 build I did about two years ago continues to run flawlessly and I am very satisfied with it...but that being said, it's probably time to put another in the safe. As always, gas port is the question. I emailed X-Caliber barrels and their sales team wasn't able to get me a number, but did say that I could request a port size on a barrel. I would really like to know what they would put on the barrel standard, but if I can't be sure, I'd like to spec out my own. The build would include: Barrel: 16" 6.5 Creedmoor Gas: Rifle length Gas Journal: .750" or .875" I haven't decided yet Buffer: H3 AR-15 (3-1/4" length, 5.4 oz) Buffer Tube: A5 (7-5/8" depth) Buffer Spring: Tubb's SR25 flat wire Carrier: JP Full Mass So, my references based on research on this forum: An 18", 308 Win, RLG, .750" journal needs a ~.095" port [.001566 in³ volume, 5.5" dwell] A 20", 308 Win, RLG, .875" journal needs a .090" port [.001803 in³ volume, 7.5" dwell] A 16", 308 Win, RLG, .750" journal "probably needs bigger than .094" (later found in a different thread that this would probably need to be maxed out at .125") [.002712 in³ maxed out, 3.5" dwell] The 16", 308 Win, RLG, .936" Fulton barrels needed a .105" port to run right [.002719 in³, 3.5" dwell] A 20", 6.5 Creedmoor, RLG, .936" journal "could use a...port diameter of .070" [.001293 in³, 7.5" dwell] An 18", 6.5 Creedmoor, RLG, .875" journal, .087" port was "too much gas" (Seekins AGB turned in 2.5 turns for good function) [.001816 in³, 5.5" dwell] A 20", 6.5 Creedmoor, RLG+2", likely .875" journal, .088" port after being modified by PROOF for function [.001858 in³, 5.5" dwell] A 20", 260 Rem, RLG, unknown journal, .071" port (probably getting opened up to .080-.090") [assuming .936" journal - .001330 in³, 7.5" dwell] My supposition from this information is that I need roughly .002000 in³ of port volume. This equates to a .091" port on the .875" journal or a .102" port on a .750" journal. If anyone has any experience with a 16" rifle length gas 6.5 Creed/260 Rem, I'd love to hear about it!