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You are watching: How to take apart a 12 gauge shotgun


It is situated in eastern Alton, IL, right across the Mississippi River, and right increase the road a mile from the Olin Winchester ammo plant, whereby all your shot shell production still takes place:

After a long delay with no complimentary time to exactly the damages Photobucketup walk to mine OP, I"ve made part time to execute a complete rewrite, making use of to hold the pics, hope forever. Whatever is brand new, except the total itself! :mrgreen:M12"s space still abundant and reasonably inexpensive this days, through over 2 million manufactured in between 1912-1963, and a few after that. Unfortunately, in spite of that they to be pricy in your day, lock too often have to be left dirty, and many space rust buckets, mine included, many thanks to unknown vault owners. That still shoots favor a dream, though! 8)The rust may be due to the fact that taking castle apart come clean them effectively is one intimidating secret to part owners, though together you will see, it shouldn"t be. :?All referrals are indigenous the target of the gun, spring forward in the direction of the muzzle, and part numbers and names used, together this chart shows:

***MAKE certain THE gun IS UNLOADED, and THE create SAFETY ON, FIRST!***The M12 presented in the assembled and also ready come fire condition:

LOCKING and UNLOCKING THE magazine -- Separating the gun into two halves, known as "takedown."The an initial step of disassembly, (and last step of reassembly in reverse order,) is come unlock (lock) the Magazine pipe (21) ("Mag" hereafter) because that takedown. This deserve to be done as frequently as girlfriend like, and also becomes second nature through practice, as with an O/U. I keep my M12 in a takedown case, similar to my O/U.The newspaper locking pin (19) ("Mag pin") is presented in the locked, prepared to fire, 11 o"clock position:
Note the Mag is fully rearward, (locked and also ready to fire condition,) v the Mag pen right beside the Magazine band (14) ("Mag band").During takedown and also reassembly, you should take care for the threads on the Barrel (11) and also Mag, and also their mates within the recipient (1):
Depress the Mag pin to the 5 o"clock position, then rotate the Mag pin and Mag with each other (the pin is her lever) come the 8 o"clock position, one-quarter turn:
If the Mag won"t revolve with the leverage detailed by the Mag pin and also your fingers, you may have grime, rust, or damage, one of two people under the Mag band, or in the Receiver/Mag threads.IF and also ONLY IF that won"t rotate easily, an initial try removed the Magazine tape bushing screws (12) ("Mag tape screws") (shown set up above/removed below) to enable the tape to be spread a small bit wider on the Mag:
The Mag band should never
do immovable call with the Mag, yet it does organize the Barrel tight when the two screws space installed, by design. The Barrel is fixed, the Mag is draft to slide forward and also rearward through the (snug) Mag band, only as soon as unlocked, come disengage the receiver for takedown.The Barrel above is presented popped the end (the Mag band functioning prefer a "U-shaped" spring v the screws removed.) This is the normal means the Barrel is ***LATER STEP*** be separate (and reinstalled ) from (to) the Mag.Also, the "Barrel flange" is shown, which goes right into the Mag band and also Magazine band bushing, (13) right into mortises cut into them.***As with whatever on neglected guns, if other is stuck, soak overnight or much longer with penetrating oil. If that doesn"t complimentary it up, watch a gunsmith. Never use tools which generate extreme leverage. This pistol is designed come only need a 3/16th" hole ground standard reminder screwdriver to disassemble.***Assuming the Mag slides freely, on slide the Mag, activity slide (25) and action slide handle (28) ("Slide") forward around 4" until they all contact the "Mag flange:"
The Mag flange"s rear edge is the forward border of take trip for the activity slide sleeve screw lid (27).The Slide, cap, and also handle are typically left installed on the Mag. The cap calls for a special tool from Brownell"s, or a home made one, to remove, and also there is no reason to for common cleaning.The action slide (25) bar should be completely retracted indigenous the Receiver, before you attempt to remove the forward half of the gun native the behind half.
***THIS WILL cause DAMAGE:***
***THIS IS PROPER:*** activity Slide bar totally flush through the Receiver expansion (8) before you try to different the halves:
Hold the Buttstock (47) and also Receiver still, save forward push on the Slide, and also rotate the forward fifty percent of the gun just slightly much less than one-quarter turn clockwise, then gently draw it forward and also clear of the Receiver, carefully so as no to bung the threads. A an excellent "cheat" is to hold the pistol vertically, so over there is no side-load ~ above the threads.The M12 in takedown:
Note again, the difference between when the Mag is unlocked, above, slid about 4" forward from the Mag band, contrasted to once it is locked:
SEPARATING THE BARREL from THE MAG -- It"s going come start acquiring tricky now!The Mag have the right to be left internally intact or disassembled, top top or turn off of the Barrel, her choice. The exception is if you want to remove the Mag tape and action slide manage retaining (leaf) feather (15) from the Mag. To remove those, both the Barrel/Mag separation and also Mag disassembly room required, together, however we"ll host off ~ above that, until we disassemble the Mag.Once the forward half of the gun is complimentary of the Receiver, set the recipient aside.As mentioned over in the stuck Mag band comments, remove the Mag tape screws, and "pop" the Barrel apart from the Mag by inserting the fingers of both hand in the gaps between the two components .
The Barrel and also attached Receiver extension is then set aside for common cleaning. Leaving the expansion attached come the Barrel. Removing and also adjusting Barrel stress and anxiety is just for a well-experienced M12 gunsmith come attempt.
Reassembly will certainly again it is in the reverse:Gently place the rear end of the Mag right into the recipient extensionLine up the Barrel
flange v the reassembled and also installed Mag band and also Magazine plug stop (16), (see below, looks prefer Felix the cat)Make certain the Mag flange (not the Barrel flange) is at the 9 o"clock position:
Squeeze the Barrel ago into the Mag band, by make "fists" approximately the Barrel and Mag, and also slowly close up door them.Finally, reinsert and also tighten the Mag band screws. Some may wish to consider Blue Loctite?This also all becomes 2nd nature v practice, despite it need not be excellent regularly, unless the gun gets wet or you desire to "deep clean" it.DISASSEMBLY and REASSEMBLY the THE MAG -- now it starts getting a tiny complicated! :?The Mag pin has a tiny "spring-clip" collection into a slot on the side of the pin. One finish of the spring is rounded, the other forms a protruding "tip."
Note above, the spring inside the Mag pin has been depressed v a small standard screw driver (the only tool required) and also removed native the Mag, then partially reinserted to show the proper means it is reinstalled, later. It only works one way!***The rounded end of the spring should BE reinstalled top top the 8 o"clock end, and also the protruding "tip" in the direction of the 2 o"clock end. Memory aid: "TIP-TWO" (like "tip-toe")
***Next, reverse the Mag pin and stick it earlier in the hole as an easily removed "keeper," when you eliminate the 2 tiny newspaper plug screws (18) (also presented are the Mag band screws)
***If girlfriend don"t execute it this way, if the pin is totally removed and you unscrew the plug screws, the Magazine feather (22) will certainly shoot the newspaper plug (17) (not the Three-shell wood plug (24)) out prefer a rifled cheese of just about exactly the gauge your gun is!***Conversely, if you leaving the Mag pin mounted normally, and first remove the plug screws, friend will have actually nowhere near enough hands to host the gun, and also the plug, and try to work the pen spring the end of the me on this!Then the Mag plug is hosted by the thumb against spring pressure, the Pin conveniently withdrawn, collection aside, and also then the spring tension slowly released, spanned with the palm that the free hand.
Remove the Mag spring and Magazine monitor (23) and also clean, swab with oil, and/or change with a brand-new spring to her heart"s content.My gun was developed in 1929, and also while I have no idea if this is the initial spring, mine gun never obtained a fall of love before I bought it about 5 years ago, and also I haven"t changed it. Appears to work perfectly, and also I shoot a same amount of trap, skeet, 5-Stand, and Sporting Clays v it, far an ext than its ahead lifetime total round count, evaluate by the lack of inner wear.
Next is removed the above mentioned magazine plug protect against (16), "Felix the cat." the is a ring through two "ears," one because that each side of the Barrel. That slides off and also on the behind of the Mag plug, obviously. The trick is psychic which way it goes ago on!
Finally, currently you have the right to slide off the Mag Band, the Magazine tape bushing (13), and also the action slide manage retaining spring (15) (leaf-type).That is the Mag completely disassembled, if ever before you want/need to perform it.Removing components on the M12 is easy, however there are number of WRONG ways to reinstall them, and only one correct way!First, back on through the Mag band, after ~ you properly install that is bushing; that means the large-side cutouts with threads showing are upwards, towards the Barrel.Next, slip the sheet spring ago under the band:
Now it"s time come rebuild the Mag internals:First, put the Mag follower on the Mag spring, and also loosely insert in the Mag.Next, the slot
in the Mag plug goes on the contrary (right) side of the mag flange. This slot and the gauge-stamped tab ~ above the Mag plug avoid ("Felix") is what borders the rotating the the Mag come one-quarter turn.

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Before inserting the Mag plugin the Mag, the plug stop is slide over the behind of the plug, v the stamped gauge number ~ above the tab dealing with towards the behind of the Mag (follower end) and the tab in the slot.Then, compressing the Mag feather flush with your fingers, the Mag plug is placed in the Mag, through the plug stop ears pointing up to receive the Barrel.It is all temporarily held along with the reversed Mag pin again, climate the plug screws space replaced and also tightened. Some might wish to take into consideration Blue Loctite?
Finally, with the plug screws tight, the Mag pen is withdrawn, and also reinserted properly, from the 8 o"clock direction, with the "tip-two" (o"clock.) The pin spring is depressed through the screw driver tip, and the pen inserted.It now will not loss out (the objective of the tip,) yet it additionally will cycle from unlocked to locked properly; if it is set up incorrectly, the won"t bicycle properly, or that may autumn out ~ above the ground and also could be lost.The Mag pen is left in the 8 o"clock position until you great to rejoin the two halves of the gun.RECEIVER contents -- Only 4 parts to issue about, and also they are nearly all easy!The trigger/carrier team is called Guard-complete assembly (45). I advise leaving it together as a unit. Yup, contact the gunsmith if that needs an ext than a spray or dunk job. The screw heads space staked, if that provides you one idea of their permanency:
Removed the one screw at the rear end of the cause guard v the previously mentioned 3/16ths" hole ground conventional screwdriver.Pull down and also rearward top top the trigger Guard. A slight side-to-side wiggling may help. If jammed, soak overnight through penetrating oil. If tho jammed, yup, watch a gunsmith.
Shake the gun, and the cutoff should autumn out. If wedged in v grime, gently press ends through fingers to rock earlier and forth. As a last will pry very gently after ~ soaking in penetrating oil overnight; it is only organized in by shallow round mortise in the center. Or, earlier to the gunsmith if it has REALLY been neglected! :roll:Next, place the recipient on that left side, v Ejection Port facing up. Eliminate the Ejector and ejector spring (30), by gently prying with your screwdriver:
Next, remove the Breech bolt. Memory aid: "rocker switch," shown depressed forward because that shooting forward
The receiver is currently empty.Reinstall in the turning back order:Hold recipient upside down, and also slide Breech Bolt "up and also in," organized flush versus top that the receiver through your finger, against the Firing pen retractor (35) spring pressureBreech bolt rocker move depressed forward with you screw driver. ("forward come shoot forward.") You can now take your finger off the underside the the bolt.Lay the receiver of that left side, ejection port encountering up.Slide in the Ejector spring in flush, using simply your fingertips. Start behind the slot, and gently guide it forward; it will drop right in! If it gets stuck sideways, eliminate with screw driver and shot again; that becomes simple with practice, just like everything else.Lay the Cartridge cutoff earlier into that is slot and also round holeGuide the Guard ago in and also up, careful not to knock the end the cutoff, and reinstall the screw at the behind of the create guard.AND FINALLY!To reassemble the 2 halves, make sure the Mag pin is in the 8 o"clock position.With the forward half of the pistol turned slightly much less than one quarter clockwise to the behind half, so the Barrel object mesh through the receiver (lack of) threads, gently slide them together, making certain the slide is fully forward, i beg your pardon holds the Mag and slide bar completely forward.Rotate the forward half counter clockwise, again assuring the on slide bar is totally retracted. Align the Mag through the Receiver. Slide the Mag aft till its threads are aligned, then lock with the Mag pen by rotating the Mag indigenous 8 o"clock come 5 o"clock. Climate pushing the fin through to 11 o"clock position, i m sorry keeps the Mag native unscrewing.The total is now ready come shoot! {hs#