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 Will 147gr 9mm stay subsonic in a 16" barrel?
0uTkAsT  [Member]
8/15/2011 8:54:49 PM EST
Like the title states, I'm contemplating various suppressor hosts, and I'm wondering if anyone has chrono'd a 16" 9mm carbine with factory 147 ammunition to see how much velocity it picks up in a longer barrel.

Any data and personal experience is appreciated, thanks!
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GUNSnDONUTS  [Member]
8/15/2011 9:21:58 PM EST
The increase in barrel length (usually 18" noted in the charts) increases the fps about 200. YMMV
GunDisaster  [Team Member]
8/15/2011 9:25:53 PM EST
I've heard that some factory 147grn ammo can go supersonic, but i think most stay subsonic. I really like Fiocchi 158grn ammo to run with my 9mm suppressors, stays subsonic with all my barrels. Of course to be fair the longest 9mm barrel i own is 10" long. I highly recommend to SBR your rifle if you can, totally worth the extra cash.
0uTkAsT  [Member]
8/15/2011 10:24:31 PM EST
Thanks! I plan on buying a Beretta CX4 and I will likely SBR it, I was just curious how well the 9mm responds to longer barrel lengths. Tax stamps are a bitch.
UnkleKrunkle  [Member]
8/19/2011 10:53:59 AM EST
Try different 147gr 9mm brands. There will be variations between how much powder each company uses on average. Just like how PMC is a weak load and Sellier and Bellot is a hotter load. Also you can reload 9mm. I do it. It's really easy to reload compare to other pistol calibers. You don't have to trim the cases to the same length and crimp them. Saves a lot of time. My cost in materials to reload fifty 147gr Hornady hollow points is around $9. I think to buy them retail would cost about $35. You can play around with the amount of powder you use in a reload to make sure it stays subsonic out of a 16inch barrel.
graysonp  [Team Member]
8/25/2011 6:49:54 AM EST
Originally Posted By 0uTkAsT:
Thanks! I plan on buying a Beretta CX4 and I will likely SBR it, I was just curious how well the 9mm responds to longer barrel lengths. Tax stamps are a bitch.


Read up on 922R regulations before threading the CX4 for a suppressor. You'll have to swap some parts out to US made if you want to comply with the law.

I've heard conflicting information on whether or not an SBR stamp bypasses 922R, so maybe someone here has more info on that.
Karl_Withakay  [Member]
9/2/2011 12:49:29 PM EST
Ballistics by the inch 9mm
finishman2000  [Member]
9/3/2011 12:39:17 AM EST
in my storm/uzi/high point, the 147 cast i use comes out ar 1270fps, same ammo out of the handguns is 1070.
Fredmisery  [Member]
9/11/2011 3:37:28 PM EST
Originally Posted By graysonp:
Originally Posted By 0uTkAsT:
Thanks! I plan on buying a Beretta CX4 and I will likely SBR it, I was just curious how well the 9mm responds to longer barrel lengths. Tax stamps are a bitch.


Read up on 922R regulations before threading the CX4 for a suppressor. You'll have to swap some parts out to US made if you want to comply with the law.

I've heard conflicting information on whether or not an SBR stamp bypasses 922R, so maybe someone here has more info on that.


If he buys a CX4 I'm pretty sure it's already going to be 922r compliant, why would threading the barrel make a difference? If anything, adding a suppressor is just adding another US part
novaDAK  [Team Member]
9/12/2011 2:33:37 PM EST

Originally Posted By Fredmisery:
Originally Posted By graysonp:
Originally Posted By 0uTkAsT:
Thanks! I plan on buying a Beretta CX4 and I will likely SBR it, I was just curious how well the 9mm responds to longer barrel lengths. Tax stamps are a bitch.


Read up on 922R regulations before threading the CX4 for a suppressor. You'll have to swap some parts out to US made if you want to comply with the law.

I've heard conflicting information on whether or not an SBR stamp bypasses 922R, so maybe someone here has more info on that.


If he buys a CX4 I'm pretty sure it's already going to be 922r compliant, why would threading the barrel make a difference? If anything, adding a suppressor is just adding another US part

Cx4s are made in Italy, have a 'thumbhole' stock, and don't have a threaded barrel. Kind of like how some AKs were imported back in the day (minus the Italy part ).

BravoSector1  [Team Member]
9/23/2011 7:28:44 AM EST
You can make the Storm 922r compliant making the threaded barrel for suppressor use a non-issue. Parts can be had, based on availabilty, HERE. If you utilize american made magazines this will count as 3 compliance parts. The CX4 suppresses well. This is still a very gray area. There are many SBRed PS90s, SCARs, Glocks out there that may (or may not) meet 922r requirements...yet were approved by the ATF to configure for SBR use. If 922r requirements were intended for all...the ATF....SHOULD....require the requester to prove the weapon is 922r compliant prior to approving for SBR. They don't....and it would be up to the BATFE to prove otherwise should charges be brought. Again...VERY GRAY area.
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