18" Ballistic Advantage Build

[SuaSponte]

108gr ELD-M Velocity: 31st to 40th Round, 77 Degrees, 28.8 in/hg, 48% Humidity - 10 round average of 2525fps

[grayfox]

Welcome aboard! Nice shooting, I do like those luth-ar mba-'s.

[Dino11]

That's a nice looking rifle, and welcome to the site. 6 ARC's defiantly have a dedicated following. It will soon be the AR rifle that will dominate the platform, it just came out at a bad time when ammo is hard to find. You pretty much need to reload not only to keep shooting but to reach the rounds full potential.

[StoneHendge]

Welcome aboard! I don't know what I like better - your group hit and is clustered around the aiming point (a rarity on the world wide web) and you noted your temp with your velocity.  But I think what I like best is that your handguard is only as long as it needs to be! We're a rare breed....

   

[SuaSponte]

Thanks guys - first time I built with serious accuracy in mind. Lapped/Trued the Receiver Face, and Loctite 620'd the Receiver Extension - my attempt at shimming with .001 Stainless Shim Stock, was an abysmal failure, LOL. I'm not thrilled that the Superlative AGB is exposed like that, but I wasn't going to spend ~$180 to make it 3" longer - the role of the rifle, shouldn't see it getting banged around as much as its shorter 5.56/.300BLK brothers. My personal Range is limited to 50yds, so that impact point was calculated via Applied Ballistics, to equal a 100yd zero - but after playing around in Strelok Pro, I'm going to re-zero at 50yds, as that will match up pretty close to the HUD-DMR Reticle in that PA GLx Scope. Mil Turrets, so best of both worlds: BDC or Dialing via DOPE. If my rounds aren't exactly on POA, my ADD kicks in

[StoneHendge]

I wouldn't worry about your gas block getting knocked around. M16s and M4s have been doing it for 60 and 30 years respectively, and they see a lot more abuse than your rifle (hopefully) ever sees. In return you don't have 3" of metal far from your rifles fulcrum throwing off its balance.

[SuaSponte]

I wouldn't worry about your gas block getting knocked around. M16s and M4s have been doing it for 60 and 30 years respectively, and they see a lot more abuse than your rifle (hopefully) ever sees. In return you don't have 3" of metal far from your rifles fulcrum throwing off its balance.

Good points.

[Baz7]

I wouldn't worry about your gas block getting knocked around. M16s and M4s have been doing it for 60 and 30 years respectively, and they see a lot more abuse than your rifle (hopefully) ever sees. In return you don't have 3" of metal far from your rifles fulcrum throwing off its balance.

Agree...My Knights SR-15 legacy model has an exposed gas block. So does the SR-25 and the Mk12s. All three setups have been used hard overseas with no issues.

[danm]

Hey SuaSponte maybe you should go post your build and group over on Eagle Eye Shootings 6 ARC AR bashing video

[SuaSponte]

I'll check it out - is that on YouTube?

BTW, at about rounds 45-50, I gained about 60fps at around the same atmospherics as before. 2583fps 5 shot average.

[StoneHendge]

I'll check it out - is that on YouTube?

BTW, at about rounds 45-50, I gained about 60fps at around the same atmospherics as before. 2583fps 5 shot average.

Was it the same lot of ammo? I've had Hornady ammo differ by >30 fps back to back. Even had different colored primers.

[SuaSponte]

That....I didn't think to track - good catch. I've been buying 100rd (20rd singles), and 200rd packs, whenever they are in stock, from different vendors - very well could have been different lots through the Chrono. Next time I'll be sure to log that, thanks.