IIRC, most of those old "Ninja-look" kits (well, yes, I did have a couple, myself) came with the camo version already with gas-tube installed. YMMV.
There IS REPEAT "IS" a difference in length between Russ., and Norinco, and Yugo/com.bloc.) gas tubes. But driving out the pins shouldn't matter unless you want to keep the antique wood for later retro-installing.
"Your final readiness exam will not come after you hear "Shooters ready" on the line, but rather when you are accosted with 'Yo! Homey!', at the Circle K." Gabe Suarez. Listen-up, foot-soldiers in the Cause: wouldn't it be nice if all U.S. newspapers, plus all elected officials, worked as hard for border control as they do for gun control? Send each one a letter reminding them of the RKBA forces that go into battery at each election.