This FAB defense handguard-set would fit neither my Century C39 nor my Pioneer Arm's Sporter. Sadly, there was zero way to make the lower handguard fit, even with hours of "fitting" and research on the problem.
The lower guard, like most aftermarket polymer AK lower-guards, has a curved recess/slot in the plastic meant to encompass/fit the lips of the lower handguard cap (on wooden and OEM plastic lower guards, the cap simply goes around the guard, but on aftermarket polymer ones, they usually try to fit the cap into a slot encompassing the cap's lips).
However, even without boring the slot wider, a hammer enabled me to get the cap into/onto the guard completely - but even seated fully, the cap was not back far enough to reach the barrel-cut that the cap locks into place on. So even the flats and slot need to be moved back aput a half centered to allow the lower-guard's cap to lock into place. So, insane amount of "fitting", with harsh to fit d tools would be the only fix.
Unfortunately, the recess (and the flat surfaces the extends beyond the slot) is both too narrow and too shallow for the rifles lower cap to seat back far enough on FAB defense's lower-guard. The slot's shallowness (even when bored out with a filing tool so it clfit the into the slot at all) prevents the handguard cap from reaching the barrel-cut where the cap must lock into place on.
Being curved makes altering ("fitting") the recess very difficult - with the shallowness of the recess being its ultimat...
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