Slick sided uppers

[Dirtrax]

The method is to heat to fit. I thought I'd like to try it.
The part that is heated is were the barrel fits into the receiver. This has been working well for others. I thought I would ask to see if others could steer me towards a source that wasn't an expensive machined piece.

 

[ARlife4me]

The method is to heat to fit. I thought I'd like to try it.
The part that is heated is were the barrel fits into the receiver. This has been working well for others. I thought I would ask to see if others could steer me towards a source that wasn't an expensive machined piece.

i've never had any reason to do a "heat to fit" for accuracy or lap a receiver.

 

[rpol98]

thermal-fit, like BCM, just means you don't need to use shims to get the tight fit of barrel extension into the upper receiver front snout.