i've narrowed down everything for my new AR build except for a stock. so far, i plan to build it with a CMMG 14.5” M4 A1 SOCOM Upper w/Permanent Phantom 5C1 attached; i'll be going with a magpul maid grip, and an aimpoint COMP ML3 on a cantilever mount. (i'll be building this on a stag15 reciever) i've narrowed it down to a 6-position, or a CTR. UBRs are rumored to be great, but fuck waiting 6-positions run anywhere from $70 (for a Stag Arms) to $117 (for an LMT). CTRs are about $90-$95 bucks (from a few different online retailers). does anyone have experience with both, or one of them and care to share their story? keep in mind that im a first time AR15 builder, if that matters.