Swap out Magpul CTR?

judgedelta

Sergeant
Full Member
Minuteman
Aug 22, 2010
759
279
81
Mississippi
I just got a Rock River Predator Pursuit which had been fired a few times and customized some and came with a Magpul CTR stock. It is too short. I can't get proper eye relief on my scope and am just kind of scrunched up. Is this a carbine length tube? and will I have to put on a rifle length tube to install a PRS stock? I think the AR15 stocks are different from the PRS I have on my LMT MWS. Thanks if you can save me a few steps...
 
Stock is all of the way out. Problem is that the rail on this rifle is pretty short, right at 5 inches. Scope (Swaro 3-18) can't go any further forward unless I get a rail extension that clamps on present rail. Any suggestions along that line?