I just bought a Military contract SOPMOD stock, it looks like the older style, its sealed in a bag with a military label on it with nsn # and cage code and other stuff but putting it on my tube its super super tight. Once on I cant really even move it. I have a PSA tube which fits perfect on a Magpul CTR and STR and a LMT SOPMOD stock. Is there anything I can do to loosen it up

