Mancraft sent in news last week that the Mancraft Air Stock Support MK1 or M.A.S.S. is now on pre-order. This kit allows you to install an HPA tank and regulator in the stock rather than running a line to an external tank to power an HPA-powered rifle. Also, they have the Mjolnir adjustable sound amplifiers available now.

"M.A.S.S. available on preorder:

M.A.S.S. MK1 - Mancraft Air Stock Support MK1 - stock for M4. It can accommodate 13ci (0,21l) HP tank and the regulator (Mancraft regulators fits, Wolverine reg will fit as well).

We have quite pretty Mjolnir Amplifiers with adjustable sound here as well! check them out:

The Mancraft Amplifier is designed to turn up the volume of your airsoft guns. The device allows you to adjust the sound by adjusting the internal tube's position.