The one potential problem that no one has mentioned is that if you take too much material off the receiver face, the barrel extension could sit back too far into the receiver when assembled.
If you have M4 style feed ramps where the extension feed ramps and receiver feed ramps match up perfectly, lapping a receiver face could create a ledge that could affect how well the cartridge (bullet tip) feeds into the chamber. If you already have a little bit of a ledge before lapping, lapping could make it worse.
Do I lap my receiver faces? Sometimes I do and sometimes I don't. It depends on my mood, the gun I am building, how much time I have, etc. But before I lap a receiver, I always slide the barrel into the upper to see if the fee ramps match up OK or if there will be a problem.
Joe Mamma
"Reliability above all else"
NRA Certified Pistol and Rifle Instructor, Life Member
Glock Certified Armorer
Beretta & Sig Sauer Certified Pistol Armorer
Colt Certified 1911 & AR-15/M16/M4 Law Enforcement Armorer
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