Having had a barrel-mounted M203 on my M16A3 when I bought it, there was some modification that was done, but it was done for a different gun. When the presvious owner tried to install it on the M16, the opening was too large by alot and only big Tie-Wraps could be use to secure it to the barrel.
The rear barrel nut was of no consequence, nor was the delta ring. The heatshield I had on it was a Bushmaster (real steel), and it fit like a glove into the PTW. There was no need to remove either.
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Age verifier Northern Alberta
Democracy is two wolves and a sheep discussing what's for dinner.
Freedom is the wolves limping away while the sheep reloads.
Never confuse freedom with democracy.
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