Nice buy an M4 stock and get a lower receiver for free.... lol
if it does break you can always replace it with a 49 dollar metal one. I think a polymer lower would make a pretty good bench rifle or wood chuck platform. How is the ballance with the 16 inch barreled upper?
Its really decent...as you dont really save much on weight with polymer over aluminum...its minimal really once you mount it to the upper.
The 16inch barreled upper doesnt feel any different weight wise or really balance wise over the 14.5 with a pinned muzzle device.
The 14.5 IS more handy, but only marginally. I just prefer the 14.5 length visually, it just feels more right than a 16 with a muzzle device, which pushes it only that much closer to a rifle length 20.
Photo below is of one of my 14.5s next to the 16. Both have the New Frontier lowers on them.
The DSA I bought the parts for back when they had "introductory prices", I think the final cost on it was just about $500 also.
The DSA rifle in the picture I put a MOE grip on as well as MOE handguards. Last time I used it was at a tactical carbine class, but the lower was an aluminum DSA one...which I swapped for the polymer one. I tried to make as light a rifle as I could, short of installing a fluted barrel, or needing a tax stamp. It still needs a commercial spec MOE buttstock I think.....