My previous post FT is referring to both 80% Glock frames and 80% AR lowers, as I described in the post. I might be wrong FT but I doubt that the majority here are assembling AR's using 80% lowers. I have assembled several AR's with finished lowers, but have never used an 80% for the reasons I noted. You may have several more using 80% Glock frames, but again I would guess that the majority here assembling Glocks are using OEM frames. If 80% is your thing then go for, but I personally rather not.