View Full Version : JJ ceramic OD

07-01-2011, 11:00 AM
Does anybody know the outside diameter of a JJ? I have a MP5 foregrip that clamps onto the barrel and it only works with 7/8" OD barrels.

07-04-2011, 11:44 AM

It can't be that hard to find out. If you got a spyder JJ ceramic barrel just measure the diameter where the barrel is fattest.

07-04-2011, 05:18 PM
I'm kind of eyeballing it with a ruler, but it looks like the 7 or so inches closest to the gun of my 14" are 7/8", and the end steps out to 15/16".

Thought it worth mentioning that the spyder J&J is smaller outside diameter than other threads. Some of my friends have the A5 thread and it starts much larger. I think I read somewhere that it was reduced so it would work with the MR2/MR3 shrouds, which it does.

07-29-2011, 02:15 PM
if you still need a measurement, pm me, so i get a email.

i have one and can give you a measurement in thousandths with a micrometer