02-27-2014, 10:37 PM
The thermal dissipators fit a straight profile (no taper) .650" or .750" barrel under the handguard. True government profiles have taper to them.
An SDM AR15 will have a bull fluted under the handguards if it's the SDM I'm thinking of, otherwise it's a medium-heavy SPR profile. Neither are compatible with the JP thermal dissipators.
The Lilja Wasp profiles are compatible, to the best of my knowledge, but I will have to check them against these specs:
http://www.jprifles.com/instructions/JP%...PATORS.pdf
An SDM AR15 will have a bull fluted under the handguards if it's the SDM I'm thinking of, otherwise it's a medium-heavy SPR profile. Neither are compatible with the JP thermal dissipators.
The Lilja Wasp profiles are compatible, to the best of my knowledge, but I will have to check them against these specs:
http://www.jprifles.com/instructions/JP%...PATORS.pdf