I've been on a quest to find a gray flat top upper receiver to go with my gray M16A1 lower. I have not had any luck, so I've decided to use the gray Eagle Arms upper receiver that I purchased for a target AR15 that I had built in the mid '90's. Unfortunately, the method of removing the handguard is not obvious. My assumption was that the handguard was simply threaded into the barrel nut, which it may be. However, no amount of twisting will cut it loose. BTW, the scope is remove and the upper/lowers separated. The upper is now sits in a upper receiver vice block in my vice. Suggestions?
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