I have a problem with my Nerf Recon. I drilled out all the AR's and re-loobed the plunger tube and head, and stretched the sprig a little. With those mods i now get good ranges. So one day I opened it up so I could do some cosmetic work, and I noticed that the o-ring had stretched. I went out and bought a new one that fits perfect. I reloobed it and the proformince has dropped by at least 15yd. I need help what do I do? (sorry about any spelling errors)