Re: UBR or PRS again
There are a lot of options for precision shooting. Most of them aren't tactical though, and most aren't especially easy to find. EGW makes a really nice adj. stock, looks like it would be at home on a space gun. Don't think you could make one much lighter. This would give you a fully adj. rear xyz, but the buffer tube/stock top doesn't move or change. The buffer tube looks like it slides into a cheek rest and that doesn't move. No problem getting the nose on the charging handle, and it is approved for NRA Hi-power. You could probably make (or maybe they make) or attach some kind of additional rest if desired, like perhaps duct tape a piece of foam pad. We used to do that with A2's sometimes.
Which brings me to A2's. They are hard to beat with irons on the AR! Unless you are shorter and/or prefer the A1. I mean, they were made for that, and the nose to the charging handle, that is part of the training doctrine. I find myself doing it from time to time with certain rifles.
When it came to building my 20" 6.5 Grendel recently, I wanted the "perfect SDM rifle" as I used to be an SDM instructor in '03 and I always thought the ACOG on the M4 to be sub-par. I kept it as .mil as possible, but used really great parts, especially inside. I considered the PRS, the UBR, and ultimately, the A2. The rifle will wear a scope, but it has irons too, the KAC flip ups, and they are similar in geometry to factory fixed irons. Now I have a PRS on an FAL and it has the problem you speak of --since the cheek rest isn't adj. in the x axis as you look at it from the side, you cannot get your face closer to the action. The closest you can get is an unstable and uncomfortable "weld" where the front point of it is dug into your cheek. They really need to make a gen.2 version where the cheek rest is redesigned to be adj. in xyz axes.
The UBR looked like it would do it, and it certainly is stable, but for the price and weight (it is heavy, as is the PRS, and costly, as is the PRS) I went with the A2. And I am perfectly happy with it. I've been using it for a long time and so I am really comfortable with it. There are no adjustments, but then again, I don't need 'em on this rifle. I'm tall enough, 6' or so, so the A2 works fine as does the A1 for me.
VLTOR and some other company make a stock that looks like the SOPMOD stock, but fixed instead of collapsing. Think a loooong SOPMOD stock (with loooong battery comparments!). So the length of the A2 (and/or A1 I think also) but with the superior cheek weld of those SOPMOD stocks.
For tactical adj. stocks, for shorter barrels than 20", I really like the LMT SOPMOD. I have 3, two LMT's and one B5. I don't particularly like any of the knockoffs by Magpul or VLTOR or even the B5 that is pretty damn close and $100 cheaper (and perfect for most carbines with a collapsing stock, but not for "shooters"). The LMT kit that comes with the stock and the buffer tube with buffer and spring and small parts, it actually locks up nearly as good as a fixed stock! And the cheek weld, at least for me, is just great. I don't like my carbine extended far, so if I want my nose on the handle and half my cheek firmly on the stock, I can do so. I noticed the B5 kit doesn't lock up as tight, but the stock will on the LMT buffer tube. So not all "mil-spec" is created equal. Those stocks are also a lot cheaper on a complete, factory assembled LMT Defender 2000 with standard trigger (I usually put in a Geissele and change out the grip and trigger guard with Magpul parts, but it is an extremely well made lower and saves me the trouble of putting it together myself).
This is my tactical rifle, the 6.5G, were it strictly for formal competitions, I'd go with that EGW stock for sure, along with JP guts (which the Grendel has; the JP Tactical bolt carrier is the bees knees, and their upper and lower small parts are some of the best made).
BTW, I used a Larue SPR-S and Leupold Mk4 MR/T 2.5-8x36/M1. Same as the SPR M4 mount, but it has an extra 10MOA built in. Their QD mounts are really, really nice, and considering the size of your obj., one of those may work for you. If you call with your info, they can tell exactly how it will fit and what will work and what won't. Just some info I learned, the Leupold Mk4 eyepiece will clear the KAC and KAC micro 600m rear flip sights in this Larue mount, but it will not clear the ARMS 40 series. Not sure how the USO will work out, but we'll see...
Sorry so longwinded, hope it helps some, had nothing better to do at the moment. Been down this road and built a lot of these rifles, and everyone prefers different stuff, so this is just my own preferences.
