I recently had an inch pattern L1A1 assembled by a gunsmith from a British parts kit on an Imbel inch-pattern receiver. I took it to the range for the first time today and was experiencing failures to feed and eject with the correct inch-pattern mags. Exchanging the mags and adjusting the gas pressure made no difference. I'm using NATO stamped 7.62 ammo, but the nose of the round seems to be binding against each feed ramp, and I've had to pound the charging handle to eject the spent brass after about .5 inch of travel on the bolt carrier. I'm wondering what could be causing this. I also noted that the barrel washer he installed while it seems to time the barrel correctly is too large in diameter and does not allow the handguards to sit flush. I'm an M4 armorer but have little experience with gunsmithing a FAL so my question is two-fold to all you FAL buffs out there - firstly, what could be causing these failures and secondly are there different diameter barrel washers available for these weapons? Thanks in advance guys - any input much appreciated!