The AK is a Romanian SAR-1 and I'm having a bitch of a time putting on a new forearm. The wood on the upper half covering the gas tube doesn't want to rotate out. I'm thinking the inconsistent weather here in Ohio has something to do with it. When a part is described as "drop-in", I take that to mean "you will be dicking with this part for several hours before it will fit properly". I'm afraid that I'm going to have to cut out the crappy old wood out of there with a saw and then try to pry it out with a screwdriver or something. I don't honestly care though, it's just that the whole thing is taking so long as I only have a few basic tools. Any insight would most appreciated, guys.