Troy Kim, (2roy.com) has sent in some details of a new part he’s made for the WA M4:
Dear Arnie. Here is my new product for WA M4. POM material reinforced cylinder for WA M4.
Many people complain about durability of normal parts, I made this as a spare parts.
Because It’s not so easy to get spare parts and should order as a sets of cylinder before, I release this for easy maintenance and high pressure tuning.
Thanks a lot. My best regards, Troy Kim, (2roy.com)