lower rails

[sendo]

Ok got my flat bent and did the heat treat. now the rails need to go in. I have been reading different sites and see different instruction. one being that I need to grind the left rail so I can use 762x39, then another site say to do the right side. do I do both?

[FEDUPWBS]

depends on cal. You must cut enough to insert mag and then file to center mag. Shoot, if FTFeed adjust in the correct direction.

[fireblast713]

so do you install the rails prior to filing? I was under the impression you fit then weld them on.

[vandal]

Lock them in place with small C-clamps, file to get close to a good mag fit, then weld and touch up with file/dremel.

so do you install the rails prior to filing? I was under the impression you fit then weld them on.

[scotthmt]

i usually install them and then grind them to fit, im sure there is probably a better way, has worked for me though.

[JHC]

i usually install them and then grind them to fit, im sure there is probably a better way, has worked for me though.

Same here, I weld them in, file the ejector and mag stabilizers to fit, and heat treat.