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Discussion Starter · #1 · (Edited)
OK, I have a JAC .22 kit for the AR. The plate in the back is meant to butt up against the buffer tube in an AR. In the SCR, the plate can not clear the stock, as it slopes inward to accept the recoil link on the BCG. If I remove metal from the bottom/bevel the plate as shown by the blue line, it will fit and it will work. However, I am concerned that this could be unsafe - if I don't do it exactly right there COULD be some up/down wiggle MAYBE. Since the .22 is not gas operated and does not recoil against the buffer (it has it's own recoil spring and the BCG rides on the two rails shown, which are not attached in the affected area, asking for opinions if this can be done safely. Don't really care if the kit is ruined, have only used it twice in 20 years, but the SCR appears to be really really ready to be a .22!

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I would do it and wouldn't be concerned about it being unsafe. You definitely want to remove a little at a time so you don't end up with any play in it. It's going to shoot ****ty groups out of a 1/9 twist barrel. I would suggest selling that kit and getting a dedicated .22 upper for it. Then you could switch it back and forth with your AR also.
 

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Discussion Starter · #3 ·
I would do it and wouldn't be concerned about it being unsafe. You definitely want to remove a little at a time so you don't end up with any play in it. It's going to shoot ****ty groups out of a 1/9 twist barrel. I would suggest selling that kit and getting a dedicated .22 upper for it. Then you could switch it back and forth with your AR also.
I would not spend the money for an upper. This would be a freebie, which is why I am considering it. The SCR uses a red dot sight, so it is not going to be really target accurate anyway, just basically banging away,

Like I said, my concern is safety - I have to take some metal off the bottom, and then bevel/contour it to fit. the top should still be totally supported, and even in an AR, the buffer tube moves, so the entire thing always has some play in it.
 

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You will be fine. The rear plate actually is supported by the section of lower receiver above the buffer tube. They actually make a nylon plug that will go in the buffer tube on an AR so it pushes on the back of that plate to take up any wiggle. 22INSERT PRESSURE PLUG I'm not sure what the lower is like but you could always make a shim out of plastic to tighten it up if there is too much play.
 

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Discussion Starter · #5 ·
In the SCR it does not contact the lower receiver at all. The top would wedge up against the plastic buttstock, and the beveled lower part of the plate should just slide by the lower part of the inside of the stock, where the recoil assembly is located. The recoil rod/spring is on the very top of the assembly, so everything below the top 1/16 of an inch does not really come into play, as far as I can see. The actual bolt slides back and forth on the two rails, but does not come anyplace close to making contact with the plate - the ONLY contact is at the very top, where the recoil spring compresses. The plate looks like it is staked or welded on, then ground down to level. So as long as the recoil does not break the weld, I am not seeing too many bad things happening. Of course, it could possibly damage the plastic inside of the stock, but I don't suppose that a replacement stock would be all that expensive. Anyway, the RECOIL of the 5.56 is taken up by the spring assembly in the LOWER part of the stock/PG area, I doubt the upper part of the inside of the stock ever makes contact with anything. The BC is very short, with a long strut on the end. The strut matches up with the recoil assembly in the lower part of the stock, that appears to be the only contact. The BC does not appear, to me, to ever come back far enough to contact the stock, it is just too short. That is why you can use any upper but must use their BC.
 

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Discussion Starter · #10 ·
It took a couple of hours with a Dremel and I had to take off more than I anticipated, but it now fits and the action closes.
I tried to use a very very thin neoprene washer as a buffer between the back plate and the lower, but NOTHING fits, it is tight. I can see light through the joint with a flashlight help up to the rear, so there is "some" space in there, but not much. I do have a concern about the back plate damaging the lower on recoil, but I can not fit anything in there any thicker than maybe a piece of duck tape, if even that. So I don't know, I do not want to ruin a $900 rifle!
 
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