Bought 4 of these mage recently. None of the plastic followers work to lock back the bolt.
FWIW, I have 2 AC Unity mags and neither lock back the follower.
Investigating -- NOS Czech Aluminum mag springs are ~50% longer than the AC Unity springs, and by spring loops it's even worse -- 24 on the OEM mag and 13 on the AC Unity (counting each loop protrusion including first and last along the rear spline), which is little more than 1/2 the amount of spring material due to AC Unity having bigger loops/more space between loops. The Czech OEM aluminum mag body is only ~1/2" longer.
that's probably why with finger pressure I can't push down the bolt catch portion of the OEM mags but can w/ the AC Unity mag springs that lack enough power to actuate the LSBHO...
Are the aluminum mags Czechpoint's selling still NOS surplus and do their springs match genuine surplus in quality?
And how do the transparent mags springs compare to to OEM aluminum? The same spring?
*AC Unity mags also wobble more side to side than OEM aluminum, but that's not the cause of the LSBHO malfunction.