Anyone running a 7in barrel on their ar15?

[tp555]

I have made a short barrel in 9mm for a customer that cycles with factory ammo.Barrel is 10" using the gas system.The gas tube is about 3 inches long and straight.Spring is normal but buffer is 9 oz.Just to see how much umph it has.Blank is special tight bore in 9mm.With heavy spring and 9 oz buffer it cycles with can but not without it.So how far can you go? You need custom gas block and short gas tube.Barrel nut was different.

[JFettig]

My next project is to take the evo barrel and figure out how short it can go, I've got 2 gas ports(third is plugged) to play with in 2 positions. I'll start at 6" and work down from there.

I've been considering doing a DI 9mm like TP555 is talking about, I've got some 9mm blanks that need cutting. I think that with 9mm you'll be required to shoot handloads.

Jon

[Titleiiredneck]

Just finished my 8" 300/221 build yesterday, bought the barrel from spook he posted about previously in this thread. m4 upper 16 bolt/carrier and a yhm spectre handguard. Should be fun once my new scope comes in !

[Titleiiredneck]

crap picture, but here is the one with the 8" barrel by spook. m4 upper, 16 carrier, yhm diamond handguard "spectre" swr 300 can, pof sbr lower milled for a rdias, magpul ctr stock and miad grip, waiting on a scope and then will break out the chrony for some 200-220 load development.

[JFettig]

Here is the one I built for a friend.

[Titleiiredneck]

Originally Posted by JFettig

Here is the one I built for a friend.

looks good, did he have any issues cycling? also got my scope in along with my bipod adapter today! should work up a load this week if i get a chance!

[JFettig]

I'm sneaking up on the port size for him so he has a better chance at running supersonic rounds, last time we were out(first stab at the port diameter) it ran 75% lock back so I opened it .004". It should run now. I was running AA#9, he will be running W296 so it should work where it is, if not I'll open it again. I have mine running with 2 different gas lengths, both cylcle with authority.

Jon

[Titleiiredneck]

Cool, thanks! I will be using h110 since i have 5 ponds left and if it works then i will stick with it. If not then a trip to the store to buy some AA