some talon measurements please!!

i was wondering, could someone measure their talon, from the breech end of the barrel (with the gun assembled), where you thumb a pellet into, to the end of the body? i don’t silencers or anything in there… and could someone tell me, w/a 24″ barrel, how much barrel is showing outside of the talon body? im designing a foregrip, for my project, and need these measurements. thanks to all!!