I did exactly what your looking for. I have a mil-spec lower that is marked "Cal 22LR" on it. I wanted a dedicated 22LR lower I could mount my Tactical Solutions 22LR upper to. By doing this, I was able to have a "normal" magazine eject button (legally) on the 22LR rifle.
I also went one step further. Instead of having the standard push pins that mount the upper to the lower, I put a KNS screw-in type front pin. Now the rifle "requires the use of a tool" in order to separate the upper and lower from one another. But, I can still flip the rifle open for cleaning by using the rear push pin. Is this necessary, no. But, just in case something ever happens, I want to be able to say my rifle could not be swapped out for a .223 upper in a matter of seconds with no tools required...
Back to the 22LR marked lower. I looked and looked, but could not find anyone willing to sell a 22LR marked lower. And I specifically did not one marked "multi" since that in and of itself implies it can take other calibers like 223. So, I had to make my own lower...
I used a Tactical Machining pre-anodized 80% lower and had it laser marked by Ident Marking services. They do excellent work by the way! Lastly, I milled the 80% lower and installed a DPMS lower parts kit.
-Steve
I also went one step further. Instead of having the standard push pins that mount the upper to the lower, I put a KNS screw-in type front pin. Now the rifle "requires the use of a tool" in order to separate the upper and lower from one another. But, I can still flip the rifle open for cleaning by using the rear push pin. Is this necessary, no. But, just in case something ever happens, I want to be able to say my rifle could not be swapped out for a .223 upper in a matter of seconds with no tools required...
Back to the 22LR marked lower. I looked and looked, but could not find anyone willing to sell a 22LR marked lower. And I specifically did not one marked "multi" since that in and of itself implies it can take other calibers like 223. So, I had to make my own lower...
I used a Tactical Machining pre-anodized 80% lower and had it laser marked by Ident Marking services. They do excellent work by the way! Lastly, I milled the 80% lower and installed a DPMS lower parts kit.
-Steve

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