YOU ARE PURCHASING 2 SPECIALIZED CUTTING TOOLS: AN END MILL AND A TAP. DO NOT USE ANYTHING ELSE OR YOU RISK RUINING YOUR BARREL. AND NO: WE ARE NOT GOING TO PROVIDE YOU WITH THE DETAILED SPECIFICS OF THESE 2 CUTTING TOOLS. YOU TRUST US OR YOU DON'T. 

FOR THESE 2 TOOLS TO BE OF ANY VALUE TO YOU, YOU SHOULD ALSO PURCHASE OUR THREADED BARREL ADAPTER AND CAP.

AND BE MINDFUL THAT ONCE YOU HAVE THREADED YOUR OWN BARREL THAT OUR .25 CALIBER SUPPRESSOR WILL WORK WITH YOUR PISTOL! FEEL FREE TO ORDER ONE OF THOSE AS WELL - WHILE YOU CAN. POLITICIANS ARE FICKLE CREATURES THAT CHANGE THEIR MINDS. OFTEN.

MANY OF YOU HAVE ASKED US TO OFFER FOR SELL THE NECESSARY CUTTING TOOLS TO ENABLE THE "DO-IT-YOURSELF" CROWD TO THREAD THEIR OWN .25 CALIBER (6.35MM) BARRELS FOR SEMI-AUTOMATIC PISTOLS. 

OF COURSE WE OFFER A THREADED BARREL AND INDUSTRY STANDARD SUPPRESSOR ADAPTER FOR THE 1931 FABRIQUE NATIONAL 6.35MM, PSP-25, PSA-25, FRASER AND BAUER .25 CALIBER POCKET PISTOLS. HAVING SAID THIS, WE DO NOT OFFER A THREADED BARREL FOR ANY OTHER BRAND OF .25 CALIBER (6.35MM) SEMI-AUTOMATIC PISTOL - LIKE A COLT OR TANFOGLIO OR EVEN A 1905/1906 FABRIQUE NATIONALE POCKET PISTOL. 

HOWEVER, OUR THREADED BARREL ADAPTERS WILL WORK JUST FINE IN OTHER MODELS - IF THE BARREL OF THE OTHER MODEL IS THREADED TO MATCH OUR INDUSTRY STANDARD ADAPTER. AND AS MENTIONED ABOVE - SO WILL THE SUPPRESSOR WE MAKE FOR OUR OWN PSA-25 PISTOL!

WITH THIS IN MIND, WE OFFER 2 SPECIALIZED CUTTING TOOLS IN THIS LISTING FOR YOUR CONSIDERATION AND PURCHASE.

THE 2 CUTTING TOOLS WE OFFER FOR PURCHASE THROUGH THIS LISTING PRE-SUPPOSE THAT YOU HAVE THE REQUISITE MACHINIST SKILL TO PROCEED WITH THE TASK OF THREADING YOUR BARREL USING THESE TWO SPECIALIZED CUTTING TOOLS (OR YOUR FRIEND DOES), WILL BE USING A MANUAL BRIDGEPORT MILL OR EQUIVALENT MILL (NOT A HOME DEPOT MILL FROM CHINA), THAT YOU ARE ABLE TO PUZZLE OUT HOW TO HOLD YOUR BARREL IN THE MILLING MACHINE (ASK US FOR HELP). THAT YOUR BARREL IS HEAT TREATED (ROCKWELL HARDNESS 26-32) STAINLESS STEEL (OR EQUIVALENT) AND THAT YOU WILL USE THE INFORMATION SET FORTH BELOW WHEN THREADING YOUR OWN .25 CALIBER (6.35MM) BARREL. YOU UTILIZE THESE CUTTING TOOLS AT YOUR OWN RISK. WE DO NOT QUARANTEE THAT YOU WILL BE SUCCESSFUL. BUT IF YOU USE A MACHINIST GRADE MANUAL MILLING MACHINE (BRIDGEPORT), PUZZLE OUT HOW TO HOLD YOUR BARREL SO THAT IT CAN BE MACHINED (RIGID STABILITY OF THE BARREL IN A HOLDING FIXTURE (VICE), FOLLOW THE DIRECTIONS ABOUT FEEDS AND SPEEDS BELOW, THEN THE ODDS ARE WITH YOU! THE CUTTING TOOLS (EXOTIC, BEAUTIFUL THINGS THAT THEY ARE) ARE NOT RETURNABLE TO US. 

WE ARE HERE TO HELP.  REACH OUT WITH QUESTIONS. CALL/TEXT: 415-640-1094.

WITH RESPECT TO THE 21/64TH INCH END MILL, YOU SHOULD SET YOUR MILL AS FOLLOWS:

REVOLUTIONS PER MINUTE (RPM): 480

FEED RATE: 0.7 - 1.2 INCH PER MINUTE (IPM)

PLUNGE RATE: 0.2-0.3 INCH PER MINUTE (IPM)

DEPTH PER PASS: 0.050 - 0.080 INCH

LUBRICANT: MOLY DEE OR TAPMATIC STAINLESS (DO NOT USE ANYTHING ELSE)

THESE NUMBERS WILL MAXIMIZE TOOL LIFE, PREVENT CHIPPING AND GENERATE A CLEAN, FLAT COUNTERBORE FOR YOUR TAP.

WITH RESPECT TO THE 3/8-24 TAP USE THE FOLLOWING FEEDS AND SPEEDS:

RPM: 100 (THE SAFE RANGE IS 90-110 RPM)

FEED RATE: 4.1 INCHES PER MINUTE (IPM) >>THREAD PITCH = 1+24=0.041666 (FEED=PITCH X RPM = 0.041666 INCH X 100)

LUBRICANT: MOLY DEE OR TAPMATIC STAINLESS (DO NOT USE ANYTHING ELSE)

BACK OFF TECHNIQUE: 

FEED SMOOTHLY

WHEN TORQUE RISES BACK OFF 1/8 TURN

RE-ENGAGE

REPEAT EVERY 1-2 THREADS

REVERSE OUT CLEANLY AT BOTTOM

TAP DRILL DEPTH (BLIND HOLE):

THREAD DEPTH + 0.200 INCH

END END END