Prod upgraded
When I got home tonight from work I had a nice little package from Crosman waiting for me at my door step. My 20″ Mrod barrel! *Yay* My Prod now has the Mrod barrel installed. Installing it was a piece of cake. Instead of using the Prod’s shroud I used a 7.5 TKO break for it. The TKO works better in my opinion. Anyways its late, no light so I cant really test the barrel out tonight. But I will keep everyone posted.
Night,
Matt
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You should be on the right track with the heavier hammer spring. When your gun gets to 2000 psi and your velocity is higher there than it is at 3000 psi then it is a spring combo issue. This is were the TUNING gets fun…lol. A little more spring power and your initial 710 fps should get higher and that 2000 psi 740 fps things should disappear.
Even a port at .100 or .110 might make things sweeter. That .132 sounds maybe a tad too big. Remember, with airguns, a little port opening (.005-.010″) at a time goes a long way.
You are close bro. Starting at 775 fps might even out those numbers and cure the 2000 psi thingy. OK, i have to admit, i was purely guessing on that one… 😆
I’m goin to bed on that………good night 🙄
I got this thing shooting pretty good for now. According the manual a 3000 PSI fill up requires both the hammer tension and throw to be at max. So 7 for hammer tension clockwise and 12 for the tension counter clockwise.
I did that with a .132 transfer port I was getting high 800s for my FPS but only 8 shots (3000 down to 21000 PSI ) I did not like that since I only use my hand pump.. I have a borrowed tank but that’s just for filling up tanks that are empty.
Switched back to the default transfer port which is .80. Now from the same fill pressure of 3000 I got 710 FPS each shot the FPS is climbing a little as expected in this weird gun. I got 16 shots ( 3000 down to 22000 PSI ) my FPS towards 2000 PSI was around 740 FPS.
No matter what I do the FPS always climbs at 2000 PSI. I could get another 8 shots in that will be in the high 700 FPS range.
I just ordered a different hammer spring that I have in my Discovery, it’s quite heavy so that might help out. I also ordered a HDD from AoA it replaces the hammer pin and reduces wasted air between shots. On average you’ll get 40% increase on consistency and PSI usage per shot. That will get here Thursday, should be interesting.
Anyways, this little gun is grouping quite well with the Marauder barrel. I was happy that I did not get a crappy barrel from Crosman. With Crosman Premiers I group dime size at 20 yards. I tried out JSB 18 grain pellets and got a quarter sized group.
At my current set up I am sighted in at 20 yards, 1 mil hold at 50 yards 2 mil hold at 65 yards and 4 mil hold at 80 yards. 80 yards is my max range in my yard.
I hope that I can get a more consistent shot string with more tweaking of the settings.. it’s frustrating but I’ll get it down eventually.
Now to fill my gun back up and go relax!
-Matt
Love the TACTICAL look. Cant wait to hear more about her
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We shall see. I got the HDD today from AoA.. I get one extra magazine of shots in per fill. I was not expecting much but I will take an extra mag! The Mrod HDD is supposed to be better.. bigger air tube to actually get a performance gain that is better.