Gunsmithing Bedding a MPA chassis
- Thread starter NVScout
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Generally I don't advise it.
Against my better judgement we did one this weekend for a friend from Sweden who was in town... we bedded the rear tang and the front ring. Nothing around the rest of the mag.
Against my better judgement we did one this weekend for a friend from Sweden who was in town... we bedded the rear tang and the front ring. Nothing around the rest of the mag.
I have personally witnessed a friend's rifle go from a scatter gun to tight groups by bedding an MPA. He finally resorted to bedding it after trying just about everything else multiple times.
That being said, his was an older model without the lug lock system. I have not experienced what he did with my MPA; but my MPA is a newer model with the lug lock system. Coincidence......I'm not sure.
That being said, his was an older model without the lug lock system. I have not experienced what he did with my MPA; but my MPA is a newer model with the lug lock system. Coincidence......I'm not sure.
If it's a newer one with the lug lock setup in there then you can eithe ruse the lug lock and skip bedding or you can tape off the bottom of the lug lock screw hole and fill it up bedding. The chassis needs to be roughed up where the bedding will go or the material is highly likely to just flake right off once cured.
I recently purchased a used MPA chassis. How does one tell if he has a lug lock or not. I think I'll try without bedding and tighten the action per manufacturers recommendations for torque, and if it doesn't shoot well will look at other options.
Assuming the recoil lug rests squarely on the shelf for it in the chassis, the Luglock locates the action back against the shelf and that together with the V-block geometry under the receiver fixes the position in the chassis the way bedding would in a stock.
I just found out that MPA does not make a Luglock barrel that fits standard Remington 700 0.1875" recoil lugs so I'm going to have to DIY for my Nucleus.
I just found out that MPA does not make a Luglock barrel that fits standard Remington 700 0.1875" recoil lugs so I'm going to have to DIY for my Nucleus.
Simple solution.
Problem: The barrel can not contact and put pressure on the recoil lug. Since the barrel rides on a ramp in the front and should contact the front face of the recoil lug on the rear of the barrel.
All you need is the barrel to pull down lower in the chassis. I just filed .060" (to start) off the bottom of the barrel and it now contacts and applies pressure the way it was intended.
Hope this helps.
I filed a bit over 0.050" off of mine but realized if I file much further the contact point will be at the very bottom of the lug if it could tighten (I'm not sure it would because I still had at least 0.015" gap from the barrel to lug with the flat bottomed out.
I stuck a .45 ACP case between the lug and ramp and it looks like that diameter of 0.480" was a bit more than I need so I'll turn up a barrel that's about 0.450" with the top half cut off. That should grab the lug high which I prefer and I know it will work.
I stuck a .45 ACP case between the lug and ramp and it looks like that diameter of 0.480" was a bit more than I need so I'll turn up a barrel that's about 0.450" with the top half cut off. That should grab the lug high which I prefer and I know it will work.
I just bought a used mpa that the seller neglected to say was bedded. I have not received the action that is going in that stock. How likely am I to have to redo the bedding and how much of a pain is it?
It is a rem700 action
It is a rem700 action
Will ask tomorrow. He also modified the side and drilled a hole as seen in pic below.
I will be using this on an impact precision that is on the way.
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