To expand on what Calif-Steve wrote, most shooters agree that the LN receivers are probably safe with military ammunition, if both the rifle & ammunition are in good condition. Commercial ammunition or handloads loaded to higher pressure levels puts additional strain on the receiver. If you choose to shoot the gun, make sure the chamber is clean & dry; the bolt face and especially the firing pin hole have no eroded or pitted areas and are flat and clean; that the firing pin hole is round and not enlarged and that the striker tip is round or hemispherical and smooth; no erosion or pitting any where. Any roughness, out of tolerance, erosion, pitting, etc. on these parts can casue a pierced primer. A bad case can split or fail. Both of these conditions release gas into the action and, as noted before, that can shatter and cause catesrophic failure on the receiver.

Also, since the rifle may be a parts gun put together by someone other than the army of CMPicon, it would be a good idea to check the headspace.