If you attach a carbine kit (such as 16" barrel upper) to a handgun frame. Have you built an assault weapon by Massachusetts law, subject to the MA AWB restrictions such as no threaded barrel, collapsible stock, bayonet lug, etc?
If you enjoy the forum please consider supporting it by signing up for a NES Membership The benefits pay for the membership many times over.
Be sure to enter the NES/MFS May Giveaway ***Canik METE SFX***