Does not cycle on my setup - Tacfire AR15 Pistol Buffer Tube Kit

A 10.5in 300blk barrel with a linear compensator and adjustable gas lock pushing 215grain freedom seeds. Ejects about 35% of the time but does not feed the next round because the spring is too stiff to allow the Bcg to clear the mag on gas pressure alone. Excessively heavy spring tension makes it a workout to even charge.. Will be trashing this spring and buffer for something else.