12.5" done and SPR/M4 in hands, but too heavy

[dpaqu]

SBR a standard lower and get a Surefire Mini or the AAC Mini4. Other than that you will need to hit the gym a little. Unless you want to dump the rail etc... which will be a costly learning lesson.

I thought this was already a SBR?

I’ve seen a MITER suppressor mount fit on a 11.5” gun with a nonstandard gas block so that would move the weigh in and lose about 1.2oz. A 11.5” .625 barrel is a lot stiffer than a 14.5” .625 barrel and with the unpredictable nature of barrel harmonics I would just go with the lighter barrel and use the SPR adjustability to minimize POI shift.

I agree. The A5 should stay.

so you can't put a UBR on an A5 exstension tube?

[Cincinnatus]

I'll quote 13th Warrior: "Grow Stronger," said the battle-hardened Viking when Antonio Banderas complained about the weight of his sword.

[m249saw]

I thought this was already a SBR?

I’ve seen a MITER suppressor mount fit on a 11.5” gun with a nonstandard gas block so that would move the weigh in and lose about 1.2oz. A 11.5” .625 barrel is a lot stiffer than a 14.5” .625 barrel and with the unpredictable nature of barrel harmonics I would just go with the lighter barrel and use the SPR adjustability to minimize POI shift.



so you can't put a UBR on an A5 exstension tube?

My SBRed lower is billet, Im doing a Form 1 on a Noveske forged which is a bit lighter.

No the UBR uses an A2 fixed stock like tube, the stock attaches via a screw in the rear. A5 buffer tube wont work.

[mtdawg169]

I thought this was already a SBR?

I’ve seen a MITER suppressor mount fit on a 11.5” gun with a nonstandard gas block so that would move the weigh in and lose about 1.2oz. A 11.5” .625 barrel is a lot stiffer than a 14.5” .625 barrel and with the unpredictable nature of barrel harmonics I would just go with the lighter barrel and use the SPR adjustability to minimize POI shift.



so you can't put a UBR on an A5 exstension tube?

I don't think the spr-m4 mount will work on anything shorter than a 12.5" barrel.

[d90king]

Is it heavy or is the balance way off compounding the felt weight? I find balance to be as important and for me more important than the actual weight. I see you are running a SOPMOD and in my experience that is a great stock with just the right amount of counter balance that any of my 5.56 rifles have ever needed.

My MWS is the only rifle that I'm thinking of adding even more weight to with the UBR to help with the balance on what is already a pig heavy rifle. For the record I love the MWS and the weight doesnt bother me at all based upon how i run it. The more I run it the lighter it feels.

I got to run a DD 10.3 and DD MK18 rail with a SF Mini, IMHO it was perfection and how I will be setting up my two 10.5 LMT's.

[usmcvet]

You might try adding batteries to the tubes on the SOPMOD. It may help you balance it out.

[nml]

Pretty gun. Just shoot it without the can. That sounds like what is bothering you.

[deadlyfire]

anything smaller than a 240/249 is light to me.

[d90king]

anything smaller than a 240/249 is light to me.

Note the OP's screen name.

[m249saw]

I don't think the spr-m4 mount will work on anything shorter than a 12.5" barrel.

It will fit on an 11.5 with a small (1") gas block and 7" rail.

Im thinking about a 11.5 Noveske switchblock barrel as Ive been told by Todd at Noveske that it will work.