I personally like the Magpul PRS for a rifle length and the VLTOR EMOD for a carbine length.
At 6'2" I'm not real tall but they both seem to fit me better than most other offerings I've tried and they are quality built.
Neither one would be most people's first choice if minimum weight is a consideration.
I like the Luth-AR and have run that on my silhouette gun for over a year now. I did not like the weight of the Magpul PRS nor did I like the price. I will be upgrading mine to the new 3 way adjustable butt plate since I shoot prone and can use the cast adjustment for a better NPA across the line.
But, how will this rifle be used? I assume you are comparing the Luth-AR MBA1 to the Magpul PRS stock? Or are you talking about their carbine stocks or fixed stocks?
The luth are ok. I've never really needed to adjust comb height. I've always been partial to fixed stocks. I like the ace skeletons . Very sturdy I prefer a pull slightly shorter than standard rifle so I get the entry length with a 1" dpms spacer and the thicker butt pad is perfect length , not only is it a good length for me, but the delrin tube has no spring twang. The Rogers ss are great no play in those my preferred economy adj stock. The mft minimalist is a good lightweight adj option.
I like the acs-l and the vltor carbine stocks. I've been eyeballing the luthar carbine stocks. I'll be trying one of those in the near future. Didn't care for my ace skeleton stock. Just personal preferences.
Thanks for all the input, I appreciate all your suggestions. I decided to go with the Magpul UBR buttstock, so now I have a new question. When I contacted Magpul to order the UBR, they say I need a "carbine buffer & spring, as the UBR doesn't come with that. So my next question what buffer/buffer spring do you all suggest? I see different weights and such so again i'm looking to you all for more advice...
FWIW prefer fixed stocks. They are sturdier and don't pull the beard hairs. Plus I'm not a nose-to-charge-handle guy, would have been awkward with an M16A1
Two lowers have Magpul MOE Rifle stocks. Balances a 16" barrel nicely, storage compartment, and a good length for me even when wearing heavy winter clothing. Trying out a Luth-AR with a 18" barreled 5.56. Like it.
I have one adjustable lower, a Magpul CTR, locks up tight.
B5 SOPMOD Bravo is my favorite stock. Fantastic cheek weld, reasonable weight, simple design, and it's good enough for SEALs.
I had a fixed MOE stock on my hunting rifle but took it it off after one hunting season. IMO, the advantages of a fixed stock don't outweigh the adjustable LOP and compactness of the collapsible stock.
+1 on the JP polished carbine spring. It isn't terribly expensive and the ARs I have seem to cycle smoother. Standard carbine buffer to start, don't waste money on some fancy buffer unless you have an adjustable gas block. Love the UBR, my favorite stock.