Trigger housing drops out.

[SRiverrat11]

One of my M1's has started dropping the trigger housing out when fired. At first I had another M1 with me when it happened so I changed out the trigger housings and it worked fine. Do I need to buy a whole other trigger housing or just a new trigger guard? Any suggestions would be appreciated. Thanks! Ok. Here are some pics of the offending trigger guard( left side) and a tight fitting HRA triggerguard( right side) Stocks are the offending SA/SHM( left side) and HRA (right side)

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