Robinson Xcr Manual
View QuoteOne big meaty bolt is better than four small easily cross threaded bolts on my SCAR-17The AR-15 'only' has one big nut holding it on. Newer versions eliminate the indexing teeth that the gas tube engage to keep it from loosening.The M-60 GPMG has one lever to attach the barrel.The M249 has one lever to attach the barrel.The M-240 has one lever to attach the barrel.The key is OPERATOR CHECKS.Also known as the 10% rule:The operator has to be 10% smarter than the wrench & equipment to insure it works and is used correctly.
Originally Posted By LoadedDrum:Just like with the LMT MRP, there were people in the beginning who did not sufficiently torque the barrel bolt and had issues with the barrel coming loose. If you torque it properly (IIRC, 250 inch-lbs), it does not come loose. I have a 3XX serial number XCR in case it matters.You might want to have the mods move this the Armory for more views from more XCR owners. Otherwise ask on XCR forum.Except that the MRP is a safer and more secure design due to its two cross bolts, one of which makes it impossible to lose a barrel (short of a fully catastrophic cross bolt failure) and which result in circumferential fixation of the barrel.The only way you are going to lose a barrel on an XCR is if the barrel bolt fails so I don't see your point about the MRP being safer. Regardless, my original point was that the XCR is not the only design subject to USER ERROR.
Robinson Xcr Manual Download
It was not a knock on the MRP.