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WARNINGIt is against the law to manufacture, purchase, or possessa firearm silencer without proper authorization from andregistration with the Bureau of Alcohol, Tobacco, andFirearms of the U.S. Treasury Department. Inquiries regardingthe procedures for applying for a license to construct,purchase, or possess a silencer and for paying the appropriatetax must be directed to that ofice.In addition, many state and local jurisdictions haverestrictions on the possession of silencers, even if appropriatelytaxed and registered with federal authorities.Do not attempt to construct a silencer without properauthorization from federal, state, and local authorities.Thisbook is presented for academic study only.• • • • •The technical data presented here, particularly concerningthe use, adjustment, and alteration of firearms, inevitablyreflects the author’s beliefs and research with particularfirearms, equipment, components, and techniques under specificcircumstances which the reader cannot duplicate exactly.The information in this book should therefore be used forguidance only. Neither the author, publisher, or distributorsof this book assume any responsibility for the use or misuseof information contained herein.

ContentsApologyIntroduction 1Tools and Materials 7Weapon #1: Ruger Bull Barrel Pistol 9Coupling #1 10Aluminum Can Silencers 11Aluminum Can #1 12Aluminum Can #2 13Aluminum Can #3 15Aluminum Can #4 17Aluminum Can #5 19Aluminum Can #6 21Aluminum Can Preparation 23Bubbler Silencer 28“Clog Buster” Silencer 30Oil Filter #1 32Oil Filter #2 34Oil Filter #3 36PVC Silencer Tubes 38PVC #1 39viiV

Workbench SilencersPVC #2 41Sprinkler Riser Silencer 42Coupling #2 46Caveat 47Weapon #2: Colt .45 49Coupling #3 50Oil Filter #4 52“Clog Buster” #2 53Weapon #3: SKS Carbine 55Coupling #4 56Oil Filter #5 58Oil Filter #6 59Bibliography 63VI

Weapon #2Colt .45The venerable Colt .45 semiautomatic pistol has been aroundsince 1911 and has a well-earned reputation for toughness andreliability. It fires a large subsonic bullet, and its .45 ACP ammunitionis also used in the silenced MAC-10 submachine gun. TheColt .45 fieldstrips very easily, and barrels can be changed in just afew minutes with no tools required. Replacing the regular 5 inchbarrel with a 7 inch barrel provides a couple inches of exposed barrelon which to mount a coupling for a silencer.49

Workbench SilencersCOUPLING #3Cut 2” section fromend of 3/4” PVC nipple.Make four evenly spaced,longitudinal slots thatextend down to thethreading.Wrap exposed portion of .45 barrel with 2” metal repair tape.50

Colt .45After friction fitting PVC section onto taped barrel,secure ittightly with two small band clamps. (If you think you need a littlemore “grab” in the friction fit, try dabbing contact surfaces with aweak glue or any sticky, tacky substance prior to clamping. Don’tuse too much glue or too strong a glue, though, or you’ll end uphaving to cut the PVC o f the barrel.)51

Workbench SilencersOIL FILTER #4This is essentially the same design as shown on page 33. Note,however, that the oil filter is tightly clamped into the adapter. Forextra strength, it can be glued in prior to clamping. Also, althoughit is not visible, the end of the oil filter has a hole punched in itscenter. Try filling the filter with water and draining it to wet filterelement inside. This might help cool the muzzle blast gases anddampen the noise even more.52

Colt .45CLOG BUSTER #2This is simply a larger version of the device shown on page30. It has eight times the volume of its smaller counterpart and alarger, sturdier hose attachment.53