[bean]

Problem solving.
Low fps for a setup that should be much higher
1.Check your cylinder for compression. Cock the gun and place your finger over the cylinder head. Fire the gun. The cylinder should not move unless you remove your finger.
2.If it does move this could mean a bad seal from your cylinder head. Remove your cylinder head and place teflon tape on the threads and screw back in. If you have the cylinder head pro do the same for the adjustable nozzle. Then repeat the test.
3.If its not compression it could be the internals. If you leave the gun cocked for a long period of time it can ruin the spring. However this shouldn't cause a huge problem. More often then not this is attributed to the high pressure piston from the zero trigger set.
4.If you still have your original piston the gun came with remove the oring from that one. Place it on the zero trigger one instead. The way the piston works is that air goes int he tiny holes int he piston head and push the oring out. However if you have to powerful of a spring this will cause air leaks around the oring. You just need a thicker oring. Worst comes to worst measure the oring and order a thicker one online.
5.Silent shaft the little white shaft that protrudes from the piston is a piece of garbage. Promptly cut it down or place the grub screw wrapped in teflon tape in place of it. It creates a pocket of air at the front of the cylinder when fired and by doing this makes the gun quieter. In the process though it dramatically drops speed of the round.
6. The pesky hopup that comes with the gun does not seal very well. Wrapping the inner barrel with teflon tape and then cutting around the hopup orifice to remove the stuff in the hole will create a better seal and boost fps. You can also get a new hopup bucking.

The rifle will not stay cocked or will not cock at all
1. If you installed the metal spring guide do this immediately. Unscrew the two halves of the spring guide and place teflon tape or threadlock in the screw groves. This will hopefully fix the problem. What was happening is that the base is being turned and coming unscrewed from the top. When the piston is pulled back in an attempt to cock the gun it hits the top of the spring guide and is unable to catch on the sear.
2.if you have to many spring tensioners installed the same problem as above will happen. Remove a couple and test.
3.If you are not using a zero trigger and this happens upgrade to the zero trigger and save yourself the heart ache. You likely wore down a sear and by the time you finish replacing everything you might as well have got it.
4.All of the above has been done however there has been no change. You may be having a problem with the sears engaging the piston. This will happen a lot in the hfc usr-11 the vsr clone. The receiver is made to large and the zero trigger sears wont catch on the piston. To fix this you may need to file down the receiver to allow the sears to catch. If you have no clue what you are doing do not attempt this under any circumstance. Give it to someone more experienced to look at. Remove the trigger guard and the rest of the rifle other then the receiver the trigger group and the cylinder. Try to cock the portion you have while looking in at where the sears are. You should notice that the sears are just moving up but not pushing down far enough engage. When you are filing do it bit by bit and keep testing.

I lost the little black cylinder from within the hopup unit
1.do not panic
2.take out a bic pen and remove the inc portion. If it is one of the old ones it should have a nice little plastic ink reservoir that looks much like the one within the vsr. Cut out the desired length and replace it in the gun.