The VMS adjustment has a jam nut on top of it. If you turn it in, it will move the adjuster in, but when you back it out, it will not.
Typically, you turn it all the way in CW, for the reference, then back it out to the setting. Many a new mrod owner, has done it, including myself, back in the day. It was also the only thing mention that had been done to it since out of the box.
Mine was shooting 780-800 FPS with JSB 18.13s from the factory. The setting were: HS= 3in,St=9out,MS=2out. 3in= 3 revolutions in from backed out all of the way, and 9out= 9 revolutions out from screwed in all the way. This was actually a very good setup for my gun, I was getting 50 shots between 780-800 FPS. I wanted more power and I installed a regulator so I didn't leave it like that, but I was pleasantly surprised at the number of shots at that power (~25 FPE) and consistency from the factory.
I have a twin to your avatar. Mine is female, 17 years old. I know ,it won't be long.Enjoy while you can.
I think 4.5 is max on vms. For a test, to see if there is a problem, vms to four turns CCW from full in, hammer throw at full CCW, and hammer spring at six turn CW from full CCW. Fill to 3k and shoot to 2k. It won’t be a good tune of any sort, but if it is not seeing any power shots, something else is wrong.Not sure how they are doing the mrod boxing, but had that issue on Fortitudes. The gun can shift around and the back of the breech scrapes on the cardboard.
Quote from: kerplunk on July 23, 2021, 09:17:42 AMMine was shooting 780-800 FPS with JSB 18.13s from the factory. The setting were: HS= 3in,St=9out,MS=2out. 3in= 3 revolutions in from backed out all of the way, and 9out= 9 revolutions out from screwed in all the way. This was actually a very good setup for my gun, I was getting 50 shots between 780-800 FPS. I wanted more power and I installed a regulator so I didn't leave it like that, but I was pleasantly surprised at the number of shots at that power (~25 FPE) and consistency from the factory.See around 800 fps out of the box is what I would expect. But maybe there’s something wrong with mine because now I’m not seeing much difference in fps whether I have the valve metering screw at 3 3/4, 4 1/2, or 7 turns out from bottom. 7 turns out was just a test as I was frustrated at seeing sub 600 FPS at 3 3/4 and 4 1/2 (all the way supposedly) turns out from bottom with absolutely nothing done to the hammer stuff yet since new a couple weeks ago. I’m not sure if I just need to adjust the hammer spring tension and stroke length or if there’s a legit problem and I need to send it back to Crosman. I also question if this rifle is A-OK of not because AoA QUICKLY sent me a synthetic .22 covered in ground up cardboard dust that has frustratingly shifting poi’s while being extremely pellet picky and potentially other issues -when I ordered a supposedly in stock wooden .177... I feel like I got some banged up left over no one inspected. Should I call Crosman? Or play with the hammer stuff first?
Quote from: Thebloodyhound90 on July 23, 2021, 05:43:54 PMQuote from: kerplunk on July 23, 2021, 09:17:42 AMMine was shooting 780-800 FPS with JSB 18.13s from the factory. The setting were: HS= 3in,St=9out,MS=2out. 3in= 3 revolutions in from backed out all of the way, and 9out= 9 revolutions out from screwed in all the way. This was actually a very good setup for my gun, I was getting 50 shots between 780-800 FPS. I wanted more power and I installed a regulator so I didn't leave it like that, but I was pleasantly surprised at the number of shots at that power (~25 FPE) and consistency from the factory.See around 800 fps out of the box is what I would expect. But maybe there’s something wrong with mine because now I’m not seeing much difference in fps whether I have the valve metering screw at 3 3/4, 4 1/2, or 7 turns out from bottom. 7 turns out was just a test as I was frustrated at seeing sub 600 FPS at 3 3/4 and 4 1/2 (all the way supposedly) turns out from bottom with absolutely nothing done to the hammer stuff yet since new a couple weeks ago. I’m not sure if I just need to adjust the hammer spring tension and stroke length or if there’s a legit problem and I need to send it back to Crosman. I also question if this rifle is A-OK of not because AoA QUICKLY sent me a synthetic .22 covered in ground up cardboard dust that has frustratingly shifting poi’s while being extremely pellet picky and potentially other issues -when I ordered a supposedly in stock wooden .177... I feel like I got some banged up left over no one inspected. Should I call Crosman? Or play with the hammer stuff first?In my opinion you should play with the hammer tension and stroke first. In fact I think you're going about things kind of backwards- I believe most people use the stroke and tension for large scale adjustments and then do fine tuning with the transfer port. I'm pretty sure you don't even have to take the action out of the stock for the hammer adjustments. It's detailed pretty well in the manual.I recommend you start with the "settings" I gave above and see it it gets you closer to the ballpark of the velocity you expected. Did you get a partial refund from AOA for sending you a syn stock instead of wood? I think it's like a $100 difference...If its only a few weeks old, pellet picky, and not what you asked for, I would consider returning it to AOA for a refund or for what you ordered in the first place. They should pay shipping, it's their mistake.
Adam, the goal of the test I recommended was to quickly determine if there is another problem, or if it is just the tune. Trying to tune with a problem, is very frustrating.
Quote from: kerplunk on July 24, 2021, 09:11:03 AMQuote from: Thebloodyhound90 on July 23, 2021, 05:43:54 PMQuote from: kerplunk on July 23, 2021, 09:17:42 AMMine was shooting 780-800 FPS with JSB 18.13s from the factory. The setting were: HS= 3in,St=9out,MS=2out. 3in= 3 revolutions in from backed out all of the way, and 9out= 9 revolutions out from screwed in all the way. This was actually a very good setup for my gun, I was getting 50 shots between 780-800 FPS. I wanted more power and I installed a regulator so I didn't leave it like that, but I was pleasantly surprised at the number of shots at that power (~25 FPE) and consistency from the factory.See around 800 fps out of the box is what I would expect. But maybe there’s something wrong with mine because now I’m not seeing much difference in fps whether I have the valve metering screw at 3 3/4, 4 1/2, or 7 turns out from bottom. 7 turns out was just a test as I was frustrated at seeing sub 600 FPS at 3 3/4 and 4 1/2 (all the way supposedly) turns out from bottom with absolutely nothing done to the hammer stuff yet since new a couple weeks ago. I’m not sure if I just need to adjust the hammer spring tension and stroke length or if there’s a legit problem and I need to send it back to Crosman. I also question if this rifle is A-OK of not because AoA QUICKLY sent me a synthetic .22 covered in ground up cardboard dust that has frustratingly shifting poi’s while being extremely pellet picky and potentially other issues -when I ordered a supposedly in stock wooden .177... I feel like I got some banged up left over no one inspected. Should I call Crosman? Or play with the hammer stuff first?In my opinion you should play with the hammer tension and stroke first. In fact I think you're going about things kind of backwards- I believe most people use the stroke and tension for large scale adjustments and then do fine tuning with the transfer port. I'm pretty sure you don't even have to take the action out of the stock for the hammer adjustments. It's detailed pretty well in the manual.I recommend you start with the "settings" I gave above and see it it gets you closer to the ballpark of the velocity you expected. Did you get a partial refund from AOA for sending you a syn stock instead of wood? I think it's like a $100 difference...If its only a few weeks old, pellet picky, and not what you asked for, I would consider returning it to AOA for a refund or for what you ordered in the first place. They should pay shipping, it's their mistake.They gave me $100 back, which is really only $60 for screwing up since the synthetic is $40 cheaper to begin with. I would’ve just sent it back but this was a few weeks ago when NOTHING was in stock. No one had Marauders except for .25’s and Crosman barreled synthetic 22’s -no .177’s at all or wood stocked .22’s with either barrel anywhere at the time.But I’m actually happy with the .22 in the end for hunting even though the jury is still out on the Crosman barrel. I do have a LW barrel on the way though...But as far as the stock goes, they also told me that Crosman is phasing the wood stock out so you won’t likely see anymore anyways. So after hearing that and with no other marauders around, I agreed to keep the rifle. However 2 weeks later everyone had wood stocked .22’s including amazon with next day delivery! So I was a little PO’d that I had agreed to keep the rifle based on what they told me when I could’ve returned it and bought the same gun with the wood stock I wanted from PA or amazon 2 weeks later. But whatever, I have a LW barrel and new Turkish walnut stock on order. So I’ll end up with what I wanted so long as there’s nothing broken or malfunctioning on the rifle. Which would require a trip to Crosman not AoA right?