MKabar has shown a huge amount of awesomeness, spearheading a small group buy of 4.1 parts on HKPRO. I've been lucky to get in and I am waiting semi-patiently. Whenever they get here, they'll go on one of my reduced reset GGI P30s. I have all kinds of performance data on those and i will report the differences then.
P.S. Wannabe, I don't think those parts are readily available for purchase.
Last edited by YVK; 12-30-2015 at 10:19 AM.
You are very right. Sorry about that. The 4.2 is all over the Internet and I seen mention of 4.1 at hkparts and assumed! It was just the TRS. Looks like you can get them if your in Germany.. My uncle is a gun loving American who travels to Germany a good bit.. Might need to get him to buy a few kits!
Until last year, we went to Europe on an annual basis and I've failed to find a dealer to buy them from.