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9/23/2020 3:47:02 PM
Posted: 12/18/2009 1:03:35 PM EDT
I've sent my Form 1 off to build an SBR, and I am looking to put on a QD silencer mount such as the AAC SPR/M4 Mod 08 mount.  However, the mount looks so long that it would destroy the benefits of having an SBR.  How much length does the AAC SPR/M4 Mod 08 mount actually add to the barrel?

Thanks
Link Posted: 12/18/2009 1:09:02 PM EDT
Originally Posted By m4shooter1:
I've sent my Form 1 off to build an SBR, and I am looking to put on a QD silencer mount such as the AAC SPR/M4 Mod 08 mount.  However, the mount looks so long that it would destroy the benefits of having an SBR.  How much length does the AAC SPR/M4 Mod 08 mount actually add to the barrel?

Thanks


Its listed on AACs website under each type. The MITER mount adds 1.75", the other 2 QD mounts add 1.875"

AAC
Link Posted: 12/18/2009 1:09:09 PM EDT
Link Posted: 12/18/2009 1:29:21 PM EDT
I appreciate it.  My Form 1 specifies a 12.5" barrel, so it looks like I would be good to go.
Link Posted: 12/18/2009 3:21:02 PM EDT



Originally Posted By cowboy7242001:


It only adds about 1.5" to the end of the barrel. The rest of it sets back over the barrel.



You would need a 12.5" barrel to have enough room for that particular mount. Or an 11.5 with a low profile gas block, not the standard FSB.


This.



I am actually going to put a 12.5 on one of my SBR uppers just so that I can put the SPR/M4 on it.



 
Link Posted: 12/18/2009 6:01:11 PM EDT
Here's mine  on a 18" barrel....extra length isnt a prob. at all, however it is still a nice chunk of metal and with that it weighs some.
Link Posted: 12/19/2009 4:43:35 AM EDT
[Last Edit: 12/19/2009 6:44:49 AM EDT by murderman]
I just mic'd one of my spare SPR/M4 Blackouts:

-OAL = 4.225"
-rear of mount to barrel thread shoulder = 1.905"
-thread depth = 0.600"
-length past end of barrel = slightly less than 1.75"
-weight = 125.8 grams [4.43 ounces]

On my 12.5" N4 with a DD lite 9.0, there is right at 3/4" gap between the back of the can and the front of the handguard.  The weapon OAL with the can mounted is almost exactly the same as my wife's 16" N4 with a Blackout, but without the can.

12.5's with reflex cans are a most excellent combination.  I also have a 12.5" 6.8 with a SCAR-H SD.

ETA - here are some pics:





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