I do not recall which forum member first reported this trick.  Thirty cents will protect a stored hand-guard from being split by the inward pressure of the riveted barrel springs.  Twist/slide a quarter into the rear spring and a nickel into the front spring.  Not my idea or discovery, but very convenient!  Thank you to the inventor.  p.s.  Always slide hand-guards, (upside down to clear the front sight stud), off or onto the barrel.  Never snap them on or off the barrel!

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