AR Sponsor
Posted: 7/8/2017 8:00:24 PM EDT
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Really wanting a 9mm, but I'm definitely between torn between a 16" and a pistol/sbr length.
Which did you choose and why? |
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I'm in the process of building two uppers.
One is a 10.5" upper, a clone of the colt 635. So that's why I chose that...I like clones. Second is a 5.5" upper. I have a 9" long 9mm subgun suppressor that I plan to bury in the handguard with the barrel. The barrel and can will come out to 14", and I'll do a 10" hanguard over it. These will both be used on a colt m16 lower. So those are what I chose and why. HTH |
| If you're in a state that lets you have AR pistols, I say the current best option is a 9mm pistol with a brace because we can shoulder them now. Build one of those and you can always file the form1 on it later. And if you do a pistol first, you are allowed to flip flop that lower receiver back and forth between a pistol and a rifle. |
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Quoted:
Im itching for one in the 7" sbr range but biggest thing stopping me is putting in for the stamp. From what i understand 9mm doesn't need much over 5" or so If you're going to suppress it and shoot 147-165 gr sub sonic rounds, a 7" barrel is great. If you are not going to suppress it, then there is some benefit to a longer barrel. If you're shooting a load optimized for a 3.5" to 5" handgun with faster burning powder, you won't see much increase - but you'll still get an increase. However, if you're shooting a hand load with a slow burning pistol powder like Blue Dot you'll see a much more significant increase. For example I have both a 10.5" (actually 11.125" bolt face to barrel end) pistol and a 16" carbine, and depending on the load, I'll see differences in velocities varying from 110 to 300 fps second. That's a difference of only 22 fps/inch to a much more significant 60 fps/inch, depending on the bullet and the powder used. I have developed loads that launch a 124 gr bullet at over 1,450 fps, as well as loads that will launch a 90 grain bullet at over 1,600 fps in a 16" barrel. That's at least 300 fps faster than you'd get out of a 5" pistol, and still about 100-150 fps faster than you'd get with a 5" .357 Sig. In that regard, I have a 16" carbine in order to maximize performance with a 9mm in an AR, and I have a 10.5" pistol, mostly because it's a sweet spot between ballistic performance and slick handling. |
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Quoted:
I'm in the process of building two uppers. One is a 10.5" upper, a clone of the colt 635. So that's why I chose that...I like clones. Second is a 5.5" upper. I have a 9" long 9mm subgun suppressor that I plan to bury in the handguard with the barrel. The barrel and can will come out to 14", and I'll do a 10" hanguard over it. These will both be used on a colt m16 lower. So those are what I chose and why. HTH |
AR Sponsor