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UBR on the LMT MWS

cpatbay

Sergeant
Full Member
Minuteman
Nov 1, 2011
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California, USA
I am going to put a UBR stock on the LMT MWS 308. Magpul website says "custom short buffer and spring" may be needed for 7.62X51 rifle. Are these custom short buffer and spring needed to use the UBR on the LMT MWS? If they are needed, where can I get these?
 
Re: UBR on the LMT MWS

The UBR requires a custom short buffer tube, otherwise known as a receiver extension. It comes with this piece when you buy it. It also requires a carbine buffer and spring. I'm assuming your MWS has the LMT SOPMOD stock on it. If so, it contains a carbine buffer and spring already, and you are good to go. If you are switching from a fixed stock to the UBR, you will need a .308 AR carbine spring and buffer.
.308 AR Carbine Buffer
.308 AR Rifle Buffer
.308 AR Carbine Spring
.308 AR Rifle Spring

AR 15 Carbine Buffer
AR 15 Rifle Buffer
AR 15 Carbine Spring
AR 15 Rifle Spring

Buffer Comparison
 
Re: UBR on the LMT MWS

Yes, the LMT MWS comes with the SOPMOD stock. So, to swap in a UBR stock, sounds like I am good to go.
 
Re: UBR on the LMT MWS

When i called LMT about my MWS about switching to the UBR i was told i needed to change out the buffer and spring. i am looking into Slash's Heavy buffer and spring. I would contact LMT to be 100 percent sure .
 
Re: UBR on the LMT MWS

I think it also has to do with the ubr tube is a AR 15 tube. so you need to switch to a specific buffer and spring that works with the .308 AR style.
 
Re: UBR on the LMT MWS

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: OldGuardShooter</div><div class="ubbcode-body">When i called LMT about my MWS about switching to the UBR i was told i needed to change out the buffer and spring. i am looking into Slash's Heavy buffer and spring. I would contact LMT to be 100 percent sure . </div></div>

How do you like the UBR on your LMT MWS???
 
Re: UBR on the LMT MWS

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: 1kOrBust</div><div class="ubbcode-body">What is "Slash"? Or who is "Slash"?</div></div>

http://heavybuffers.com/

They're pretty expensive but from what I hear they're well worth it.
 
Re: UBR on the LMT MWS

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Pigman</div><div class="ubbcode-body">

http://heavybuffers.com/

They're pretty expensive but from what I hear they're well worth it. </div></div>

No kidding! They are expensive! Do they buy me more reliability or what?
 
Re: UBR on the LMT MWS

I don't have the rifle yet i get it paid off next week. i just picked up the parts that i wanted to upgrade. from what i read you will like it. I also recommend picking up a Battlecomp Ba muzzle brake for it . if you are not going to suppress it . Look into Giselle triggers also. they seem to be what everyone likes to upgrade too on the LMT MWS also. I am decideding now on my back up sights . I am leaning towards KAC micro's or Troy flip ups. I did a ton and i mean countless hours researching before i bought my LMT you should like it. just like anything else there are lemons here and there but for the most part , These rifles are squared away. The last thing i am really stuck on is Glass for it . I don't want to put a huge scope on it . I am thinking maybe a USO SN3 1.8-x10 or a NF 2.5-10 or a PST 1-6 Razor or a Leopold Mark 6 having a hard time deciding on which one to go with.
 
Re: UBR on the LMT MWS

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: OldGuardShooter</div><div class="ubbcode-body"> I don't have the rifle yet i get it paid off next week. i just picked up the parts that i wanted to upgrade. from what i read you will like it. I also recommend picking up a Battlecomp Ba muzzle brake for it . if you are not going to suppress it . Look into Giselle triggers also. they seem to be what everyone likes to upgrade too on the LMT MWS also. I am decideding now on my back up sights . I am leaning towards KAC micro's or Troy flip ups. I did a ton and i mean countless hours researching before i bought my LMT you should like it. just like anything else there are lemons here and there but for the most part , These rifles are squared away. The last thing i am really stuck on is Glass for it . I don't want to put a huge scope on it . I am thinking maybe a USO SN3 1.8-x10 or a NF 2.5-10 or a PST 1-6 Razor or a Leopold Mark 6 having a hard time deciding on which one to go with. </div></div>

Wow! Sounds like you have your LMT MWS rig pretty well planned out! Should be a really nice one when it's all done. I am going to "steal" some of your ideas for backup sights and trigger. Save me many countless hours of research!

For glass, I already have a NF 2.5-10. I am actually thinking about selling this and buy a higher power scope. I know, it's going to add weight and it's not that good for shorter ranges ...
 
Re: UBR on the LMT MWS

Another question for you, OldGuardShooter, what's your opinion on the differences between the Battlecomp Ba vs the one that comes with the rifle?
 
Re: UBR on the LMT MWS

I want to set my MWS up for 6oo ish yards and in . if i do one of the scopes with a 10 power i'll stick a off set RMR or Micro T-1 on it. I am setting this up more as a battle rifle set up instead of just a LR target set up. if you are going for a LR target set up go with the PRS stock instead of the UBR . i think you will have a harder time if you put a big scope on it for cheek rise. I want a small scope low to the rifle . the UBR feels great though for red dots or small scopes. I am also looking around for someone to Dimple my barrel. I am going to have two set ups one with the BA comp on it with a dimple barrel and a back up barrel with a Can on it . That is another HUGE reason i went with the LMT . i love the fact we can swap barrels on the fly like that.
 
Re: UBR on the LMT MWS

besides 5 pmags the Battlecomp BA was the first thing i bought for it. watch some videos on people using the LMT with one on it . That sold me right then . Also ask any of the guys that have one they will tell ya it works damn good. I hated the sights that come on it . you would have to have a scope way too high on a Mount to keep those sights on it.
 
Re: UBR on the LMT MWS

I have a JP LRP-07 with the UBR stock and I LOVE IT. Check out JP"s new captured spring as I have one in my UBR. I know you will LOVE IT.
 
Re: UBR on the LMT MWS

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: OldGuardShooter</div><div class="ubbcode-body">besides 5 pmags the Battlecomp BA was the first thing i bought for it. watch some videos on people using the LMT with one on it . That sold me right then . Also ask any of the guys that have one they will tell ya it works damn good. I hated the sights that come on it . you would have to have a scope way too high on a Mount to keep those sights on it. </div></div>

I don't like the stocked sights as well ... probably just take them off and sell them.
 
Re: UBR on the LMT MWS

oh man thank you that is just what i want on the dimpling . That should help with weight . these are very front heavy. plus i think the dimpling will match well with the rails.
 
Re: UBR on the LMT MWS

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: jevan</div><div class="ubbcode-body">I have a JP LRP-07 with the UBR stock and I LOVE IT. Check out JP"s new captured spring as I have one in my UBR. I know you will LOVE IT. </div></div>

How is the new captured spring better than the "ordinary" ones?
 
Re: UBR on the LMT MWS

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: OldGuardShooter</div><div class="ubbcode-body">I want to set my MWS up for 6oo ish yards and in . if i do one of the scopes with a 10 power i'll stick a off set RMR or Micro T-1 on it. I am setting this up more as a battle rifle set up instead of just a LR target set up. if you are going for a LR target set up go with the PRS stock instead of the UBR . i think you will have a harder time if you put a big scope on it for cheek rise. </div></div>

I don't know what I am going to really do with it yet. The closest ranges with more than 200 yards near where I live is just too far. I also looked at the PRS stock but didn't quite like the "bulk" look and more added weight ...
 
Re: UBR on the LMT MWS

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: OldGuardShooter</div><div class="ubbcode-body"> watch some videos on people using the LMT with one on it . That sold me right then . Also ask any of the guys that have one they will tell ya it works damn good. </div></div>

I looked at the battlecomp ba brake a little closer .... I am already prepared to have to spend more time cleaning the MWS. Don't you think the "many small holes" on the Battlecomp brake is going to be a PITA to clean?
 
Re: UBR on the LMT MWS

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: OldGuardShooter</div><div class="ubbcode-body">I don't think it will be too bad. i am looking at recontouring the barrel now that you showed me that link lol. </div></div>

Recontouring? Personally, i think that would look better and probably take a little more weight out.
 
Re: UBR on the LMT MWS

Also, fluting would look pretty cool, too.

BTW, have anyone heard when other barrels for the MWS will be available? Maybe a 260 or a 338?
 
Re: UBR on the LMT MWS

JP Capture Spring is simple to remove because it is one piece. But it also takes away felt recoil from the action of the bolt when firing. It makes you think that you are shooting a BOLT gun instead of an AUTO. It is not a big deal but it is nice.
 
Re: UBR on the LMT MWS

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: jevan</div><div class="ubbcode-body">JP Capture Spring is simple to remove because it is one piece. But it also takes away felt recoil from the action of the bolt when firing. It makes you think that you are shooting a BOLT gun instead of an AUTO. It is not a big deal but it is nice. </div></div>

Interesting. I didn't know there is a difference in felt recoil between semi auto and bolt rifles. Learn something new everyday!
 
Re: UBR on the LMT MWS

<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">Yes, the LMT MWS comes with the SOPMOD stock. So, to swap in a UBR stock, sounds like I am good to go.
</div></div>

Correct. At the risk of sounding cocky, if they told you the MWS uses a standard AR 15 buffer and spring, they are wrong - it would not function properly if that were the case. The Slash heavy buffer will work, as will the Emdom, but they are not necessary. The buffer and spring in the LMT MWS SOPMOD stock are designed for .308 carbines, and will work in the UBR-specific buffer tube/receiver extension.
 
Re: UBR on the LMT MWS

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Tactical .22</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">Yes, the LMT MWS comes with the SOPMOD stock. So, to swap in a UBR stock, sounds like I am good to go.
</div></div>

Correct. At the risk of sounding cocky, if they told you the MWS uses a standard AR 15 buffer and spring, they are wrong - it would not function properly if that were the case. The Slash heavy buffer will work, as will the Emdom, but they are not necessary. The buffer and spring in the LMT MWS SOPMOD stock are designed for .308 carbines, and will work in the UBR-specific buffer tube/receiver extension. </div></div>

Doesn't sound cocky at all ... Just the stuffs I need to know! Thanks!
 
Re: UBR on the LMT MWS

The UBR utilizes an entry length receiver extension. It is similar in design to an A1/2 but roughly the length of an AR15 carbine receiver extension. With the 308 platform, the longer BCG needs more room to recoil backwards and thus needs a shorter buffer for proper function. Having the Slash CAR10 allows both proper length and weight. I have a UBR and CAR 10 setup on my MA Ten and couldn't be happier. Would definitely get this set up on a MWS. The stock is phenomenal.
 
Re: UBR on the LMT MWS

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: sgtbutt</div><div class="ubbcode-body">The UBR utilizes an entry length receiver extension. It is similar in design to an A1/2 but roughly the length of an AR15 carbine receiver extension. With the 308 platform, the longer BCG needs more room to recoil backwards and thus needs a shorter buffer for proper function. Having the Slash CAR10 allows both proper length and weight. I have a UBR and CAR 10 setup on my MA Ten and couldn't be happier. Would definitely get this set up on a MWS. The stock is phenomenal. </div></div>

Thanks. Sounds like UBR with an appropriate buffer is the way to go for me!
 
Re: UBR on the LMT MWS

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: heatseekins</div><div class="ubbcode-body">You should play with the trigger you have in the lmt first. It doesn't feel much different than the ssa-e's that I have. </div></div>

I am definitely going to shoot with the stock trigger for a little bit first before forking out $250 for another trigger. Thanks for the feedback.
 
Re: UBR on the LMT MWS

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: 1kOrBust</div><div class="ubbcode-body">I don't know what I am going to really do with it yet. The closest ranges with more than 200 yards near where I live is just too far. I also looked at the PRS stock but didn't quite like the "bulk" look and more added weight ... </div></div>

I'm pretty sure UBR is heavier than PRS, but UBR better looking too
smile.gif

1kOrBust, I hear you man nowhere to shoot for distance around me either. We have to go to Sierra Nevada's for that or all the way down to Coalinga to use bro's LEO range thats out to 1000. I'm in SF Bay Area. What I did is I got a higher dollar 6x variable & then a less dollar 12x (SS 12x42) fixed for when I get chance to shoot far out there. But I've been using the 12x for 100 range too, actually since I got that I haven't put the
6x back on. When I can I'd like to get a USO SN3 1-10 to replace the USO 1.8-6.
 
Re: UBR on the LMT MWS

Actually, the UBR is about 0.2 lb lighter than the PRS.

Regarding the higher power scope ... with aging eyes, larger dots are easier to aim than smaller ones. I much prefer higher power scope until I have to move around.