DIY 44 Caliber - BIG BORE AIRGUN - Scratch Built Deer Hunting PCP at 200 bar for 300FPE - Homemade

------------------------Disclaimer-------------------- Fabrication Disclaimer: Any time you are using a machine that cuts steel the machining forces or cutting surfaces can KILL YOU. Pressure Kills Disclaimer: I am not an expert or engineer. However I know high pressure air is even more dangerous. It can KILL YOU OR OTHERS AROUND YOU. I don’t know anyone’s ability or attention to detail. These are are critical for safety (your calculations, measurements, material selection or ability to use tools properly). I cannot give you enough information in youtube comments to warn you how to proceed or all the dangers or steps you must take for success (not hurting yourself). I ask everyone wanting to make an airgun to join a forum to research this for months before undertaking any project. Any questions/answers addressed about air gun fabrication probably will be missing a lot of critical information you need to know. Don’t assume it is enough. Please look up how-to on Or another airgun build forum. These guys can give you good information and review what you are doing for safety. ------------------------------------------------------------- This is a “.44 caliber“ (.429) airgun made from scratch (uses a modified Spyder Paintball trigger system and a cut down Chaszel 44 magnum barrel liner). Tube is 1“ x .083 DOM steel, valve and endcaps are 1“ 416, pins are Grade 8 or “better“ SHCS with one very large one hidden by the trigger. All these pressure tube components were tested to 7200 PSI with no issues. Breech is 1“ 416 Stainless with threaded barrel. Bolt/handle and hammer cocking handle are large Grade 8 or 12.9 SHCS. Bolt handle is 5/16“ and rear breech bolt is 1/4“ as recommended for safety. Throated for up to a 310 gr bullet but it may need a little work for more FPS or maybe remain just a pipe dream. It may now shoot the 310 gr after a peek poppet and TP throat increase modification. As of 3/21 it shoots the 245 gr at about 740 FPS for 300 FPE and should do a little beter at 3500 psi. Round ball may break the sound barrier?? Last pic shows a recovered round ball from the range at home that expanded to .655“. It takes about 210 pumps to fill it to 2900 PSI (start of shot string curve happened to coincide with 200 bar) and gets about 4-5 shots. Please take high pressure gas serious. It can kill you or others around you. If you point it at a deer it can kill that too. There is the benefit. Cheap deer, predator, turkey hunting (cheap but not easy). Overcoming objections: this is a minimal FPE deer gun depending on the whitetail and where you shoot it. I will be working on getting a little more power or a different one altogether. Check out for more information about airguns and safety! ;) God bless