I don't know what models you are talking about and I'm not going to look them up.
If you put a barrel shorter than 16" on a rifle lower (has a shoulder stock) you have made a Short Barreled Rifle (SBR) If you don't have NFA paperwork for this, you have committed a felony.
---------------------
__________________
"9mm has a very long history of being a pointy little bullet moving quickly" --Sevens
|