SAA - Carbine Hbar 300 Blackout 16" Chromoly 1:8 AR-15 Barrel
Posted by Steve on 24th Mar 2013
Went together easy, finish is great and a great shooter.
Posted by Unknown on 23rd Jan 2013
These are the first barrels (I bought a 5.56 also) that I've used that have parkarizing in the chamber and bore.
The build went together well, the fit and finish on the outside are on par with the best. Then I went and shot it. It wouldn't cycle Subs at all and would not hold open with anything. Also the brass as seriously marred from the poor finish in the chamber.
Being that today's market is seriouly inflated and company's are behind with orders I decided to see fix it myself. The first thing I did was polish the chamber with some lapping compound. It stayed in spec and leaves no marks on the ejected brass now. The next thing I did was try anything and everything to get my rifle to cycle with all loads. The final fix after swapping springs, buffers and carriers was to enlarge the gas port to match the gas tube's maximum flow. Now it cycles all loads but still won't hold open on the last round.
These barrels pull copper like crazy. It takes me a good two hours using sweets to get clean patches after only 20 rounds. That doesn't mean they're not accurate. My .300 barrel will print 100 yard 1.5" groups with just a red dot. The 5.56 barrel will do the same or better with non surpluss ammo.
Do I recommend this barrel? Yes, for the price you won't find a more accurate barrel. I'm going to fire lap them both in hopes of squeezing some more accuracy out of them and easing the cleaning process.
Posted by GBasal on 22nd Dec 2012
No issues with upper build. Cleaned barrel well and shot a veriety of reloads. getting MOA and some sub MOA @ 100yds. Next week I'll work on 200 yds. Great buy. Very happpy with Surplusammo.