MarkLeupold Posted January 11, 2023 Report Share Posted January 11, 2023 Hello from central Iowa. Came across 308AR.com this year while planning out my newest rifle build and, boy howdy, there's a lot of good information here I don't think I could've found anywhere else! My build is pretty much complete, just need to get it out and test fire it once I get the time to. The important stuff: Aero M5 upper and lower 11.75" Bartlein .308 Win barrel, carbine gas, the port was in the ~.082 size JP High Pressure Full Mass BCG VLTOR A5 buffer tube Carbine H2 buffer Tubbs AR-10 flat wire spring (I came across the recommendation of at least an H3 buffer and no flat wire springs too late) BRT EZ-Tune gas tube, they gave me a .062 gas port for my setup. We'll see if it works. It also has a LAW folding adapter on it. I'll certainly be around trying to soak up information and probably asking a few noobish questions since this is my first venture into large frame rifles. I'll definitely be back later when I try to suppress this rifle with a CGS Hyperion QD, preferably without an adjustable gas block...it'll be an adventure, and I'll need some guys that know more than me! Quote Link to comment Share on other sites More sharing options...
MarkLeupold Posted January 11, 2023 Author Report Share Posted January 11, 2023 My early conceptualization of the build: Quote Link to comment Share on other sites More sharing options...
MarkLeupold Posted January 11, 2023 Author Report Share Posted January 11, 2023 And I guess I do have a noob question to start off with: I've got a Cross Machine and Tool UHPR 11.9 Gen 2 rail on this rifle and it doesn't have any handy alignment features on it. Does anyone have experience with a good way to consistently align the handguard with the upper receiver? With any luck, this will get a clip on thermal unit in the future and I want to make sure everything is as aligned as it can be when the time comes. Quote Link to comment Share on other sites More sharing options...
jim3326 Posted January 12, 2023 Report Share Posted January 12, 2023 Slide this on your upper and hand guard and clamp in vise. Quote Link to comment Share on other sites More sharing options...
Armed Eye Doc Posted January 12, 2023 Report Share Posted January 12, 2023 @MarkLeupold, welcome to the forum. My first observation of your build is that it appears that you have assembled a short barreled rifle. A carbine buffer tube and a sub-16 inch barrel is a rifle that needs an NFA tax stamp. I just want to make sure that you don't unknowingly get a felony. Quote Link to comment Share on other sites More sharing options...
shooterrex Posted January 12, 2023 Report Share Posted January 12, 2023 I just clamp a scope mount across the upper and rail till I get the rail tight. Quote Link to comment Share on other sites More sharing options...
MarkLeupold Posted January 12, 2023 Author Report Share Posted January 12, 2023 1 hour ago, jim3326 said: Slide this on your upper and hand guard and clamp in vise. 4 minutes ago, shooterrex said: I just clamp a scope mount across the upper and rail till I get the rail tight. Awesome, nice and easy solutions! 47 minutes ago, Armed Eye Doc said: @MarkLeupold, welcome to the forum. My first observation of your build is that it appears that you have assembled a short barreled rifle. A carbine buffer tube and a sub-16 inch barrel is a rifle that needs an NFA tax stamp. I just want to make sure that you don't unknowingly get a felony. Yep, thanks for the concern, but I'm informed on the subject. That's why it's in its full form only in a drawing right now. Quote Link to comment Share on other sites More sharing options...
Armed Eye Doc Posted January 12, 2023 Report Share Posted January 12, 2023 1 minute ago, MarkLeupold said: Yep, thanks for the concern, but I'm informed on the subject. That's why it's in its full form only in a drawing right now. We have had people who had no clue. It looks like a great rifle. I look forward to a range report. Quote Link to comment Share on other sites More sharing options...
98Z5V Posted January 12, 2023 Report Share Posted January 12, 2023 5 hours ago, MarkLeupold said: BRT EZ-Tune gas tube, they gave me a .062 gas port for my setup. We'll see if it works. This is gonna be fun. I look forward to how this one will go. I have a 12.5" .308 Win barrel, 0.750" gas block diameter, with a custom 11.00" gas tube based on gas port location on the weird barrel config. Port diameter is 0.070". Runs like a champ. Seems like this will be close. Welcome aboard, man. Quote Link to comment Share on other sites More sharing options...
MarkLeupold Posted January 12, 2023 Author Report Share Posted January 12, 2023 9 hours ago, 98Z5V said: This is gonna be fun. I look forward to how this one will go. I have a 12.5" .308 Win barrel, 0.750" gas block diameter, with a custom 11.00" gas tube based on gas port location on the weird barrel config. Port diameter is 0.070". Runs like a champ. Seems like this will be close. Welcome aboard, man. Yep, mine's also a .750" gas block. Carbine length tube is the AR-15 length, so it's pretty short. Gas tube looks to end in about the right spot on the cam pin cutout. I'm way more comfortable with drilling around on a gas tube if it does need to be opened up some! 😅 I'll get her running right and then start all over when I get my suppressor for it. Quote Link to comment Share on other sites More sharing options...
jtallen83 Posted January 19, 2023 Report Share Posted January 19, 2023 Welcome from Iowa! Love those shorties! Quote Link to comment Share on other sites More sharing options...
unforgiven Posted January 19, 2023 Report Share Posted January 19, 2023 Welcome from Indiana brother Quote Link to comment Share on other sites More sharing options...
Cunuckgaucho Posted January 20, 2023 Report Share Posted January 20, 2023 Welcome from BC Quote Link to comment Share on other sites More sharing options...
Rsquared Posted January 20, 2023 Report Share Posted January 20, 2023 Welcome aboard from Maryland. Quote Link to comment Share on other sites More sharing options...
Rsquared Posted January 20, 2023 Report Share Posted January 20, 2023 Welcome aboard from Maryland. Quote Link to comment Share on other sites More sharing options...
MarkLeupold Posted January 22, 2023 Author Report Share Posted January 22, 2023 Thanks for all the welcomes, guys! Quote Link to comment Share on other sites More sharing options...
JMJ Posted January 23, 2023 Report Share Posted January 23, 2023 Welcome from Louisiana! Quote Link to comment Share on other sites More sharing options...
MikedaddyH Posted February 2, 2023 Report Share Posted February 2, 2023 Welcome from AZ. Quote Link to comment Share on other sites More sharing options...
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