I've been wanting to regulate a Regal for a few years and even tried the Altaros regulator on my first Regal but due to a lack of plenum it was a bust. This time on my second Regal I decided to go with the Huma XXL plenum and regulator. The XXL is designed for max power. I should have measured but the plenum was about 3" long. The original string from a 220bar fill (about 1/3 of the way into the Green zone cheesy looking DS gauge) looked like this, 16gr JSB's...909 911 915 915 924 923 929 937 935 927 936 935 936 942 935 938 937 938 936 938 941 942 940 939 944 934 936 930 930 924 923 925 914 918 909 (1/2 way into yellow) 929fps average over 35 shots, ES 35fps.
After installing a Huma 250bar gauge and the regulator at 150bar, (NOTE was targeting 160 because that's where the velocity was the highest unregulated but it happened to turn out to be 150bar once installed which I called good) per my crystal test gauge and backing off the strike a little, 250bar fill, 904 902 907 907 900 909 907 896 904 906 906 903 909 906 905 906 897 903 903 902 902 901 899 903 900 902 899 904 892 893 901, 902.5 average fps over 31 shots ES 17.
Overall I'm very pleased with the Huma's consistencyy. Before installation my POI was a little low of POA at 50-60yds then climbed and then go low again which was very annoying to me. I'm open to suggestion on gaining more shots but the long plenum and regulator may have cost me a few. Just post installation I was seeing some shot variations of 20-21fps between shots which to me indicated possibly a irregular hammer strike so I pulled the hammer assembly out and polished it and while at cleaned up the cocking pieces and gave those a polishing. This was the second time I had worked on those pieces but each time has shown some improvement to the smoothness of the cocking motion. The parts that I paid close attention to was the hammer, bolt, groove on the hammer housing where the cocking screw slides and the magazine cycling mechanism.
The biggest hurdle of the project was getting the air tube to break free from the valve body. It took a little more heat than I wanted to use but it did finally come loose. The rest was just removing two orings from the valve housing for venting purposes and dropping in the regulator and plenum.
Here are the parts that I cleaned up for improved cocking.
After installing a Huma 250bar gauge and the regulator at 150bar, (NOTE was targeting 160 because that's where the velocity was the highest unregulated but it happened to turn out to be 150bar once installed which I called good) per my crystal test gauge and backing off the strike a little, 250bar fill, 904 902 907 907 900 909 907 896 904 906 906 903 909 906 905 906 897 903 903 902 902 901 899 903 900 902 899 904 892 893 901, 902.5 average fps over 31 shots ES 17.
Overall I'm very pleased with the Huma's consistencyy. Before installation my POI was a little low of POA at 50-60yds then climbed and then go low again which was very annoying to me. I'm open to suggestion on gaining more shots but the long plenum and regulator may have cost me a few. Just post installation I was seeing some shot variations of 20-21fps between shots which to me indicated possibly a irregular hammer strike so I pulled the hammer assembly out and polished it and while at cleaned up the cocking pieces and gave those a polishing. This was the second time I had worked on those pieces but each time has shown some improvement to the smoothness of the cocking motion. The parts that I paid close attention to was the hammer, bolt, groove on the hammer housing where the cocking screw slides and the magazine cycling mechanism.
The biggest hurdle of the project was getting the air tube to break free from the valve body. It took a little more heat than I wanted to use but it did finally come loose. The rest was just removing two orings from the valve housing for venting purposes and dropping in the regulator and plenum.
Here are the parts that I cleaned up for improved cocking.
