The more I do this the more I like Yankee Hill Machine quad
rails. If you want a round front end, put rubber covers on the
rails. That way when you want to accessorize the rifle, you
peel a cover off, and bolt on what you want. Oh, you will
want to accessorize eventually...It happens to all AR owners.
I have one vented DPMS, one non-vented RRA, one non-vented
DPMS that got too close to my drill press, and is now vented
and one YHM quad rail. All future free float tube purchases
will be YHM tubes.
Squeeze
P.S. Studs are just another bolt on accessory, and can go on the
bottom rail for a bi-pod, or a side rail for a sling mount.