Originally Posted by
SteyrAUG
Ok, figured it out. If you've got an old Colt Sporter with a sear block of this type, the raised area will prevent installation.
That is because it sits above the lower receiver. However Colt guns with the milled wall like LE6920, AR6520, etc. work just fine.
That's it. Colt went full mongoloid on this ass ache. S.A.W. milled this flat in an HBAR Pappabear owns. He had it done so the real Bolt Carrier could be used.
"What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v
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