oh i say yes.
Grinder, dremel, or files?
there should not be any conflicts fitting a standard 20" H-bar to the triangular hand-guards.
you need to show us some photos of what the problem is.
i have fitted the triangle HGs to the 7.62x39 H-barrel with a hidden gas block --the gas block is far bigger than .750" there shouldn't be any problem unless you got a bull barrel--
some photos right now would certainly help us see WTH is going on.
a stock H-barrel with regular barrel nut --should fit.
this was called a heavy barrel. you can see it in midway usa barrel section dpms 20" heavy nato preban barrel with front sight.
my h-bar barrel is .875" right at the gas block, my USGI surplus a1 triangle hand-guards just slipped right on there-- no fitting grinding no nothing--
the triangle HGs have some room there -- to me it looks like anything smaller than a bull-barrel should work and none of the GI type barrels with the front sight should be so large in diameter to be a problem--
now where is it not fitting ? the front or on the back near the barrel nut?
this barrel is .980 at the front sight and that is the biggy so it might be a bull barrel. now dpms says their a2 guards will fit but doing a a1 retro so trying to make it work or change to a pencil barrel which i think would been better but son likes that heavy thing.
OK that is the deal you got a bull barrel --- yea the barrel opening on the front of my a1 hand-guards is .899"
@ .980" your probably going to have to do something with the heat shields as well.
if you can fir them it is going to be very -very close ===
just checked the triangle GIs --they look like they can be opened up to .985" YMMV--LOL
regular round hand guards from an A2 look to have more than enough opening for the .980 bull barrels.
yes but i hope i can talk him into a regular pencil barrel so i can shoot the thing but push comes to pull i will break out the dremel and let it rip and thanks for all the info.