Yep, a 13 barrel will work with a 12 rail, a 12.5 barrel not so much.
Yep, a 13 barrel will work with a 12 rail, a 12.5 barrel not so much.
I can dig it for sure. One of the reasons I have been thinking of a 12.5 is to use a 12 inch Centurion C4 Quad on one of their 12.5 barrels and then use a Rearden to mount my Fat Cat. I think it would be close enough that I could still get a wrench on the mount. I want it close but not tucked. Which sounds like exactly what you are going for as well. I am going to test fit it on my 10.3 this weekend. It has a C4 carbine cut out and the sides are 9.5 inches I think? If it's too close on that then the 12/12.5 definitely wont cut it.
Note:
Gas port is .062.
Perhaps a little blasphemy, but 13 6720 barrel is now
Bootleg Enhanced Lightweight upper receiver
Smoke Composites 12 handguard
FCD 6315KM-S 5.56 flash hider
With the gas port already lean, I figured this would be a suppressor setup.
The Israeli Defense Forces re-barreled a number of M16A1 carbines with standard M16A1 barrels chopped at the rifle gas port, re-threaded and crowned, with a new gas port hole drilled at carbine length. These were called Menusar or Mekut'zrar ("Sawed off" or "Shorty") carbines.
13 inches
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