I've assembled about 40 Tactical Innovatios billet lowers. On every one of them I had to shorten the bolt catch (bottom of the ping/pong paddle) about 1/16" and then round it a little and touch it up with cold blue. If you don't the bolt catch can't travel up far enough to lock the bolt securely when the rifle runs dry. If you don't shorten it it runs into the raised area where the mag catch is which stops is travel.
Chief Armorer for Elite Shooting Sports in Manassas VA
Chief Armorer for Corp Arms (FFL 07-08/SOT 02)
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