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Better-Mag Adapter

Better-Mag Adapter

The Boonie Packer Better-Mag S&W .22 Rimfire Magazine Adaptor allows AR15 .22 shooters using CMMG format conversion kits or dedicated uppers to use S&W M&P 15-22 magazines, with their ultra reliable last round hold open activation and easy to load thumb assist.

S&W 15-22 magazines are slightly shorter front-to-back than regular AR-15 magazines, the adapter allows these to be fitted without wobble, while allowing the magazine rear follower lever to activate a regular AR-15 bolt hold open latching mechanism.

The adaptor is easily fitted without tools, simply insert into the magazine well and it locks in place with a spring loaded plunger.

CNC machined from 6061 aluminium alloy with case hardened 1018 steel components the adaptor is built to meet the same milspec requirements of the receiver it will be sitting in.

Will not work with the following lowers:

  • Chiappa
  • DPMS
  • Kriss DMK
  • Tactical Solutions   

Please note the adapter is designed to work with CMMG format .22LR bolt conversion mechanisms which are common to many rifle builds. It will not work with other AR-15 conversion bolt groups such as CZ v22, M261, Colt, Bremmer Arms.



In order to be eligible for a refund, you have to return the product within 14 calendar days of your purchase. The product must be in the same condition that you receive it and undamaged in any way.


After we receive your item, we will inspect it and process your refund. The money will be refunded to the original payment method used during the purchase. For credit card payments it may take 5 to 10 business days for a refund to show up on your credit card statement.


If the product is damaged in any way, or you have initiated the return after 14 calendar days have passed, you will not be eligible for a refund.

If anything is unclear or you have any questions feel free to contact us.


Standard Delivery

Orders are dispatched within 2 working days and sent via Royal Mail second class signed for.

Priority Delivery

Orders received before 12:00 noon for priority delivery will be dispatched same day via Royal Mail next day signed for.  Priority orders received after 12:00 noon will be dispatched next working day.


£50 and under:

  • Standard: £4.95

  • Priority: £9.99

Over £50:

  • Standard: £7.55

  • Priority: £12.99

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