Sure is. I also switched it to a Glock mag lower and I've since expanded the family to include an APC10 SBR and Mossberg Shockwave SBS. I also have a Silencerco Osprey 9 and Griffin Resistance 22M in NFA jail and I'm waiting on a Form 1 to come back to SBR my PS90.That GHM9 looks like some fun!!