If the rear mounting is indeed the same width, then you are laughing! You'll just need to make up the new spacers for the front.

I believe someone said recently the front mounts are solid on the MC16? I think you may need to make up some sleeves for the front mounts on the MC21 frame.

StephenRC45 has just bought some MC16 barrels to experiment with so we're going to see what sort of power is available from them.
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Andy.
NSR-WORLD.COM

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