lock pin on the front is the one that you push through the lower frame to keep it on the rest of the body... when you pull it out, the lower frame detaches from the main body.
my scar had this block when I got it, so I can't say whether those dimensions are the same as earlier in the thread, I can't measure accurately the depth, only the width and length.
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Current Gear: TM G36C/SL-9, WE M14, WE PDW, KWA USP, KJW USP Tactical
Future Gear: TM PSG1, M700, ARES DSR-1 v2
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