LaRue Ultimate Upper 308 / lower compatibility

[Smitty192]

Question for all of the LaRue UU 308 owners

What lowers are compatible with the upper? I'm looking for something with ambi bolt catch / release. My Seekins SP10 lower fit but the bolt catch rubs on the upper. LaRue told me LMT and KAC should work because they were M110 cut, but wouldn't confirm 100%

Interested in hearing what some of you have tried and worked well.

Thanks

 

[6.5SH]

Mega is another know to work.
Stag can be made to work (some filing/fitting for the rear lug), but many of the LaRue small parts for the lower are not compatible and need the Stag LPK to finish it out.

 

[Eli17L]

I know of DPMS and PSA lowers working fine.
I have an upper but haven't gotten around to matching it up to a lower yet myself.

 

[6.5SH]

I know of DPMS and PSA lowers working fine.
I have an upper but haven't gotten around to matching it up to a lower yet myself.

Neither of those are the M110 style lower, both are AR-308 style. OP is asking about the large frame.

 

[Eli17L]

Neither of those are the M110 style lower, both are AR-308 style. OP is asking about the large frame.

Opps. Sorry i was trying to do to many things at once tonight.
I am interested in the large frame answer also.

 

[Smitty192]

Mega is another know to work.
Stag can be made to work (some filing/fitting for the rear lug), but many of the LaRue small parts for the lower are not compatible and need the Stag LPK to finish it out.

Mega would be a nice alternative. Thanks for the info.

 

[Snapper314]

If that UU 308 Upper is the same pattern as their OBR...

The either an LMT MARS-H or KAC SR25 Lower should fit perfectly.

 

[whatsupdoc]

Question for all of the LaRue UU 308 owners

What lowers are compatible with the upper? I'm looking for something with ambi bolt catch / release. My Seekins SP10 lower fit but the bolt catch rubs on the upper. LaRue told me LMT and KAC should work because they were M110 cut, but wouldn't confirm 100%

Interested in hearing what some of you have tried and worked well.

Thanks

Can you post a pic of where the SP10 make contact.

 

[Smitty192]

Can you post a pic of where the SP10 make contact.

Right where you raise the bolt catch lever

 

[whatsupdoc]

^^^^^
Pictures like that are great they give you an good idea of what you are getting into.
Thank you

 

[Smitty192]

^^^^^
Pictures like that are great they give you an good idea of what you are getting into.
Thank you

The pins were super tight. I didn't try and force them in. I'm concerned the LMT MARS H right side bolt catch / release might have clearance issues.

I might just take the easy way and roll with a LaRue.

 

[whatsupdoc]

Did you have the Larue upper why not just get another Seekins upper.

 

[Smitty192]

Did you have the Larue upper why not just get another Seekins upper.

I've got an SP10 already. I lucked into 2 OBR barrels and a UU kit...down the rabbit hole I went.