The shape/angle of the bend in the lever hitting the thicker billet reciever.
The MAGPUL BAD lever doesn't even engage at all on the SPARTAN lower, it is stopped by the shape against the thick part of the receiver at the bolt stop itself.
The Tactical Link was better with its straight forward 90 degree angle at the bolt stop it actually worked, but it was not a complete 100% as it is supposed to. I found that after locking it back manually or with an empty mag, A mere jerking motion or shaking it would let it go to easy. I think it was still the thickness of the receiver around that area looked like it was preventing it from engaging all the way.
Maybe if you doing a simple mag dump and change fast it is no problem, but for me I just gave up on the idea having one. I have been eyeing the PHASE 5 complete Battery lever/bolt lock all in one, but the price it is up there for 50% chance of not working.
I have a tactical link on another forged standard lower and works perfectly.




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