Did not work with frontier 9mm lower - Battle Arms Development Quick Release Rear AR Takedown Pin

Purchased this item to complete a New Frontier Armory CA comp lower. The crack open position did not work with the Frontier lower, the flat lip of the pin was to short. When pulled to separate the top the pin would cleared as normal not catching the top to crack position. also pin can come out completely with a good tug, will need to disassemble the rear and reinsert the pin. did not return, i use the flat grab pull part as a thumb rest with featureless grip.