Just make sure
1)the barrel is at least 16" overall length
2)there is a magazine lock on it.
3)you use only 10 round magazines
you can explore making your rifle featureless later. Enjoi.
He who does not fear the sword he wields does not deserve to wield it.-Kubo Tite
Assumption is the Mother of All ****Ups. Speaking of ****ups, where the Hell are all my packages