Glock 19 gen 4 with gen 5 slide July 8, 2019 16 32 64 128 Glock 19 gen 4 vs gen 5 slide Are glock 19 gen 4 and gen 5 slides interchangeable Glock 19 gen 5 fs Glock gen 5 slide lock replacement Glock g19 gen 5 9mm Glock 19 4 gen review