Just make sure you match up your feedramps on the upper receiver and your barrel extension. $100 for standard forged upper, flatop with forward assist and dustcover is the regular prepanic price!
Assumption is the mother of all ****ups.
Know what you know, Know what you don't know. -Paul Pedzolt
"Jack of all trades, master of none, though oftentimes better than master of one" -Mynshul