Mounting Premier 3-15 in Larue SPR Mount Issue

[FromMyColdDeadHand]

Going to use a JP upper as a super SPR type rifle with a PH 3-15 mil-Dot. Mount is a Larue SPR/MR Lt-104. This is my first time mounting this kind of scope on this kind of mount. PH says to use 15in/lb of torque, Larue when I talked to them, suggested 45in/Lb of torque. Not wanting to give into my inner Gorilla or spend $200 bucks on a torque wrench, I got a 25in/lb fixed wrench. I mounted the scope, used levels to get everything square. Tightened the bottom screws first, just like Larue suggested and tightened the top at 25in/lbs. Well, the scope is loose.

Anyone have exprerience with the with scope and mount combo? Should I use the short end of the allen wrenches in the bolt and almost get after it tightening the bolts? What's a common reference for 45in/lbs?

Thanks!

 

[glock24]

Re: Mounting Premier 3-15 in Larue SPR Mount Issue

The Larue mount is a bit tricky. The key is to make sure the bottom screws are tightened before the top screws.

Don't ask me why, but that is the way it must be done.

 

[FromMyColdDeadHand]

Re: Mounting Premier 3-15 in Larue SPR Mount Issue

How tight did you torque your screws? Just by hand?

 

[glock24]

Re: Mounting Premier 3-15 in Larue SPR Mount Issue

No, the bottom screws must be tightened a bit, maybe 15 in/lbs to start.

 

[Tactical30]

Re: Mounting Premier 3-15 in Larue SPR Mount Issue

The same thing happened to me. All I did was add a little more muscle behind the torque and it tightned up.

I have 2 of those mounts and I bottom tightened one like you and Larue said and then cross tightended the other one when I installed them and niether has come loose but I did have to add a little more torque for both to tighten up.

 

[FromMyColdDeadHand]

Re: Mounting Premier 3-15 in Larue SPR Mount Issue

Got it mounted and shot it today. What a scope and mount!

 

[Victor Co Heather]

Re: Mounting Premier 3-15 in Larue SPR Mount Issue

I've had the same problem so I added some blue loctite... no more loose.