Can a tier 2 AR/M4 be improved to tier 1 ?

[gunnut284]

I would check the staking on the carrier and castle nut and go shoot it. If you run into any issues send it back. The rest of this is all mental masturbation since you apparently don't have the money to buy something else right now anyways. Stag may not be "tier 1" but they generally work fine and are a decent gun. If you were talking about a DMPS or Olympic then it would be a different story.

[Moltke]

OP,

If you don't trust the rifle and you upgrade some parts, are you then going to trust the rifle? If so, just upgrade the parts and be done with it. If not, just sell it now and go buy a new gun.

If you get a new gun, just buy a Colt, BCM, DD, LMT, etc.

[JackFanToM]

Grant does sell and build reliable ARs, and has received high praise for his products and service from many members on this site. I have personally purchased an AR from him. Since I have personal, real life experience with Grant's expertise, I say trust him.