Roller-Delayed and Pistol-Calibre FRTs: MP5, SP5 and PS90

added blog Gardening

2026-08-24 18:06:21 -

Almost every guide to forced reset hardware is written for the AR-15, which is little help to anyone with an MP5 clone, an SP5 or a PS90. These platforms need purpose-built modules for architectural rather than commercial reasons. Why an AR trigger will not fit An AR-15 fire control group sits in a standardised pocket with standardised pin spacing. Roller-delayed HK designs do not share that...

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