BCM vs PRI SPR mk12 mod 0 Build

[Bastard]

The Larue and Bobro are both in the same price bracket and both seemed to get nearly universal praise. So it was almost a toss up for me. But, the Bobro clamp technology did seem more mature though and that was the general sentiment in my reading. What didn't you like about the Bobro?

the screws for tightening the rings are on the bottom/upside-down though they do supply a tool for it (cut down allen wrench) easily lost.

also it just felt bulky to me, the base seemed to be too big. yes they both live up to the hype, and in all honesty it would all come down to personal preference... I just prefer the Larue.

[tacticalcity]

LaRue also comes with a bottle of dry rub, a cool bottle opener, a bumper sticker and a nifty hat. Sure laugh now...but that dry rub is tasty! Apparently it is a Texas thing.

Obviously not a reason to buy a mount. But a nice little perk. I really do use the heck out of their dry rub. Got enough to last a lifetime. The bottle opener gets used more than it should as well.

[Bastard]

LaRue also comes with a bottle of dry rub, a cool bottle opener, a bumper sticker and a nifty hat. Sure laugh now...but that dry rub is tasty! Apparently it is a Texas thing.

Obviously not a reason to buy a mount. But a nice little perk. I really do use the heck out of their dry rub. Got enough to last a lifetime. The bottle opener gets used more than it should as well.

oh yes, can't forget about the Tactical Beverage Entry Tool aka the Dillo!

[tacticalcity]

I gave a bunch of them away for Christmas one year. People looked at me like I was nuts. Sure enough, everybody who got one uses it like crazy. The cool shape somehow helps you remember what drawer it is in and makes it stand out when looking for an opener so it is the first one you grab. The people who got dry rub raved about it as well.

[Pryde]

Larue mounts are a bad choice for a precision rifle optic with exposed turrets. The reason why is with the split rings the "hump" will obscure your view of the elevation markings on your turrets when you are behind the rifle. There is a reason why you do not often see Larue mounts often on precision rigs. Even Larue's own OBR mount has standard top/bottom rings.

The Larue SPR mount is more designed for a hunting type scope or a variable 1-4x that you just set and do not adjust on the fly.

Another thing to consider Mod0 vs Mod1. The Mod0 is a good deal lighter than the Mod1. I have a Mod1 and it is a heavy mofo.

[Pryde]

the screws for tightening the rings are on the bottom/upside-down though they do supply a tool for it (cut down allen wrench) easily lost.

also it just felt bulky to me, the base seemed to be too big. yes they both live up to the hype, and in all honesty it would all come down to personal preference... I just prefer the Larue.

The new generation bobro mounts have screws now on the top. The bobro also has greater surface contact of the locking area and auto adjusts without the need of a tool. I like larue mounts in general and own many of them, but for a precision optic, I would look elsewhere.

[alex85]

Thanks again for all the information you guys. This basically covers everything I was confused about. Now I just need to pick between BCM, PRI, and High Caliber's Mod 0 or Mod 1 (if they make it).

I'm also going to research some more mount options. With the mod 0 I have a full rail to set a scope forwards, albeit .5" higher. With the mod 1 I'll certainly need a cantilever base to extend forward of the AR flat top. Decisions, decisions.

[bigbully]

Personally I think the PRI stuff is higher quality. I built one in 308 and it's nicer than my Vltor/Daniel Defense build or my Colt. My friend has a BCM which is really nice but I would still grab a PRI before it. That said I didn't use PRI barrel. I used a Fulton Armory. Also depending on which rail you use the front sight may or may not be on the same plane as the rear. My front sight sits on the forearm rail and my rear on the upper rail. I used the rifle length rail which lies between the two. Since I'm not on the same plane PRI told me that the forearm rail sits .06 higher than the upper and I needed to file my front post to even it out. They are working on a fix but haven't gotten around to it.

[kalieracer]

High caliber makes both the Mod1 and Mod 0's their website is down today, give them a ring on Monday. American Defense and Spuhr mounts are great too.

Thanks again for all the information you guys. This basically covers everything I was confused about. Now I just need to pick between BCM, PRI, and High Caliber's Mod 0 or Mod 1 (if they make it).

I'm also going to research some more mount options. With the mod 0 I have a full rail to set a scope forwards, albeit .5" higher. With the mod 1 I'll certainly need a cantilever base to extend forward of the AR flat top. Decisions, decisions.

[kalieracer]

Depending on the .308 receiver the height over bore differs. Sights generally need to be on the same plane , unless the front has been setup to compensate .Armalite AR-10's and Older SR-25's are setup that way.

Personally I think the PRI stuff is higher quality. I built one in 308 and it's nicer than my Vltor/Daniel Defense build or my Colt. My friend has a BCM which is really nice but I would still grab a PRI before it. That said I didn't use PRI barrel. I used a Fulton Armory. Also depending on which rail you use the front sight may or may not be on the same plane as the rear. My front sight sits on the forearm rail and my rear on the upper rail. I used the rifle length rail which lies between the two. Since I'm not on the same plane PRI told me that the forearm rail sits .06 higher than the upper and I needed to file my front post to even it out. They are working on a fix but haven't gotten around to it.

[bigbully]

Agreed. If PRI doesn't come up with an alternate sight to even the plane I may switch to a gas block tower more in line with the Mk12.

[xrMike]

Sorry if a dumb question, but I assume all of these SPR builders are cutting 5.56 chambers in these guns? (since that is probably spec'd by the military)

Can you request they be cut with a Wylde chamber instead? Wouldn't you WANT a Wylde chamber?

(again, I am assuming here that Wylde provides better accuracy, since that is what all the High Power shooters seem to buy... )

[tacticalcity]

If I go with PRI then I'm actually tempted to get PRI's 6.8SPC version. If only because I have yet to give this round a go, and a precision application seems well suited for it. The High Caliber MK12 MOD1 looks seriously sexy as well. Thanks for pointing that one out. It will be a while so I may change my mind entirely by then. I'm tempted to try out a KAC SR15 upper instead if only because I get such a great price on it - when it is in stock. Not an SPR at all. But a great upper.

[FMJBT]

Regarding the weight differences between the Mod 0 and Mod 1 versions of the SPR, both end up being within a few ounces of eachother in mil configuration. The KAC free float is a simpler setup than the PRI free float tube and top rail on the Mod 0, but the KAC railed forend is also pretty heavy compared to more modern designs like the URX and DD Light rails. After adding the mandatory rail covers, the weight is pretty much identical to the PRI setup, and the ergonomics end up being worse because the covers on top of rails make the OD of the forend feel like a soup can. If building a Mod 1 style upper, I'd go with something lighter than the original KAC forend.

One distinct advantage of the Mod 0 setup is that the front sight is mounted to the barrel rather than the front of the free float tube. This makes for a more consistent setup that is not affected by forend flex induced by sling tension or other external pressure. The PRI tube also allows you to mount a Harris bipod using a simple sling stud rather than having to run a separate adapter to allow mounting it on a picatinny rail.

ARMS #22 medium rings may be a tight fit with a 50mm objective, especially if Butler Creek covers are part of the equation. My Bushnell with 44mm objective leaves about 3/16" clearance under the objective. With covers installed, the clearance goes to about 3/32".

[tacticalcity]

Great info. Thanks.