I had 6 G&P VN slant mags and sold all of them as a few had feeding problems.
I bought several TM VN slant mags, have NEVER taken them apart or lubed them and they work perfectly. The TM ones are great mags and I highly recommend them
I should note that I'm using them in a TM M16A2 that had the full G&P Vietnam conversion done. (Metal body, front end, stock, grip)
LC2: Bravo Company
LC3: Shadow APC Gunner / Staff Driver
LC4: Shadow Grenadier / Jeep Driver
LC7: Staff Grenadier / Jeep Driver
HB4: US 2nd Squad Leader
LCAD07 & 7.5: Soviet VDV!