Disassembly/Reassembly of the Browning A-Bolt II

The original A-Bolt Hunter and its BBR predecessor had several things in common. Both were manufactured by Miroku in Japan, had detachable magazines under their floorplates, and adjustable triggers. They were both delivered to the store without sights unless otherwise specified, and neither was designed by John M. Browning. The BBR was a big, heavy action. The A-Bolt arrived in 1985 to change all that with a threelug bolt and a short, 60-degree bolt throw.

This allowed rapid cycling of the action, ample scope clearance, and a bolt handle engineered to fit the human hand naturally. Further improvements to the Browning A-Bolt rifle, made around 1994, included an anti-bind bolt, a non-rotating bolt sleeve, and additional weight reduction without sacrificing the strength required for Magnum calibers.

In 1999, an opening up of the action for clearance with the increasingly popular WSM calibers gave birth to the A-Bolt II and along list of models and chamberings including the newest super-short Magnum rounds. Fresh out of the box, an A-Bolt II barrel and receiver are coated with a factory-applied anti-rust compound. Before the gun is fired, this gunk should be cleaned up with snug-fitting bore patches, lint-free cloths, and a high-quality light gun oil.

Field Stripping The magazine is empty, the chamber is clear, and the safety is off. Raise the bolt handle, depress the bolt stop, and remove the bolt to the rear. It isn’t necessary to operate the bolt stop for reinstallation, but the bottom bolt lug must be positioned as shown in the accompanying photo when inserting the bolt. Remove the barrel-mounting screw (#2), and withdraw the magazine floorplate (#40) with hinge (#34) and magazine (#33) attached.

Back out the front and rear trigger-guard screws, remove the guard, and separate the action from the stock. It may be necessary to hold onto the stock or forend and gently tap the barrel down on a padded work surface to start the out. At this time, the trigger assembly can remain attached to the receiver. Move back to the bolt for a minute. When it’s slid back into the receiver, the ejector pin (#20) has to be positioned midway in the bolt sleeve (#16) recess.

You might want to index the location with a felt-tip pen as I did for the aforementioned photo. It saves fumbling and possible surface scuffing. Detailed Disassembly Your recent experience with bolt removal will have familiarized you with the firing-pin sear (#25), also known as the cocking indicator. It protrudes from the bolt’s rear when the gun is ready to fire. Secure that portion of the indicator between protected or smooth vise jaws.

Grasp the bolt handle (#5), pull toward the bolt head (#8) to compress the firing-pin spring (#27), and give the handle a Fortunately, all take down and go back together in the same manner.

turn counterclockwise. After the one turn, you won’t need the leverage provided by the bolt handle to continue unscrewing the bolt sleeve (#16) and withdraw it from the firing-pin assembly, leaving the latter in the vise. Get a firm, finger grip on the bolt shroud (#15), pull toward the firing-pin tip, and lift the shroud off the assembly. Drift out the firing-pin sear pin (#26) in either direction with a 1/8-inch punch to free up the spring (#27), firing pin (#24), washer (#28), and sear/indicator.

Align the bolt-head key pin (#9) with its large bolt-sleeve opening. Drive the pin down and out with your 1/8-inch punch, back out the bolt-sleeve screw (#16A), and withdraw the bolt assembly (#4). The bolt head is caliber specific, and can be pulled out of the assembly. You’ll see a "pigtail spring" (#23) sticking out the rear of part #8. That’s the extractor spring, and the extractor is also caliber specific. When you pull out the spring, the extractor (#22) will fall out.

Hopefully, it will fall into your waiting hand. The ejector assembly (parts #19, 20, and 21) is retained by its pin When installed, the opening in the key pin must be aligned with the chamber to allow passage of the firing pin. (#20). The pin drifts out right to left when the bolt head faces forward. So much for taking down the bolt, but there are several reassembly tips to be covered later on. And leave your protected vise jaws standing by as your third set of hands. Now for the adjustable trigger assembly.

It’s held to the receiver by a housing screw (#54), housing-screw washer (#55), and housing set pin (#56). The latter is a roll pin. Remove it first in either direction, followed by parts #54 and #55. By the way—and this is important—the bolt-handle lock (#6) hooks onto the safety (#57). When you remove the trigger assembly, don’t lose either part #6 or #57. These are restricted parts, as are all other parts closely associated with the trigger assembly. For that reason, I’d advise you not to disassemble it further.

There’s no real need to do so anyway. If it’s dirty, soak it in kerosene or mineral spirits for a day or so, flush it out, and dry it with compressed air. If it needs adjustment, the necessary steps can be taken with the action still in the stock. The adjusting screw (#85) is turned clockwise to increase pull and counterclockwise to lighten it. The range is approximately 3 to 6 pounds.

The magazine can be removed from the floorplate by supporting the barrel at a downward angle, pressing the magazine latch (#3), and swinging out the floorplate (#40). Grab the magazine at its upper end, tilt it away from the floorplate, and carefully lift or slide it from the groove at the bottom of the plate. I think this is a nice little feature. It makes it possible to carry spare, fully loaded magazines afield, and rapidly replace an empty one by reversing the removal process.

If necessary for parts replacement, the magazine-latch assembly can be taken from the trigger guard by drifting out the latch pin (#38). Yep, it’s a roll pin. The magazine itself is best left alone beyond slight adjustment of the lips to correct any feeding problem. Why leave it alone? Part #44 that retains the magazine ramp (#45) is a rivet. If you’ve tried to buy Browning A-Bolt parts, you may have discovered that the butt plate is among the restricted parts. Why, of all things, should a butt plate be restricted?

Well, with the A-Bolt II, it’s because the factory takes extreme care to match the butt plate to the surrounding material (be it wood or synthetic). I guess they don’t believe a practicing gunsmith could do it as well. If you read Dennis Wood’s article in this issue, however, I’m sure you’ll have no problem with the task,

1 Barrel Mounting Block 2 Barrel Mounting Screw 3 Barrel 4 Bolt Assembly 5 Bolt Handle 6 Bolt Handle Lock 7 Bolt Handle Pin 8 Bolt Head 9 Bolt Head Key Pin 10 Bolt Retainer (stop) 11 Bolt Retainer Guide Pin 12 Bolt Retainer Pin 13 Bolt Retainer Screw 14 Bolt Retainer Spring 15 Bolt Shroud 16 Bolt Sleeve 17 Butt Plate 18 Butt Plate Screws 19 Ejector 20 Ejector Pin 21 Ejector Spring 22 Extractor 23 Extractor Spring 24 Firing Pin 25 Firing Pin Sear 26 Firing Pin Sear Pin 27 Firing Pin Spring 28 Firing Pin Washer 29 Grip Cap 30 Grip Cap Screw (not shown) 31 Magazine Base 33 Magazine Body 34 Magazine Floorplate Hinge 35 Floorplate Hinge Pin 36 Floorplate Hinge Spring 37 Floorplate Latch Assembly 38 Floorplate Latch Pin 39 Floorplate Latch Spring 40 Floorplate 41 Magazine Follower Rivet 42 Magazine Follower 43 Magazine Follower Spring 44 Magazine Ramp Rivet 45 Magazine Ramp 46 Magazine Retainer Spring 47 Retainer Spring Pin 48 Magazine Spring Pin 49 Inner Magazine Spring Strut 50 Outer Magazine Spring Strut 51 Magazine Strut Pin 52 Magazine Strut Spring 53 Trigger Housing 54 Housing Screw 55 Housing Washer 56 Housing Set Pin 57 Safety 58 Safety Blocking Pin 59 Safety Lever 60 Safety Lever Pin 61 Safety Lever Spring 62 Safety Link 63 Safety Link Roll Pin 64 Safety Pin 65 Safety Pin Snap Ring 66 Safety Selector 67 Safety Spring Browning A-Bolt II Bolt-Action Ri le (Specifications subject to change without notice) 68 Safety Stud 69 Sear 70 Sear Pin 71 Sear Screw 72 Sear Spring 73 Scope Mount Filler Screws 74 Front Sling Swivel Assembly 75 Rear Sight (not shown) 76 Front Sight (not shown) 77 Sight Ramp (not shown) 78 Rear Sling Swivel Assembly 79 Stock 80 Trigger Assembly 81 Trigger Engagement Screw 82 Trigger Guard 83 Trigger Guard Screw 84 Trigger Pin 85 Trigger Pull Adjustment Screw 86 Trigger Sear 87 Trigger Spring

Adjustment range is 3 to 6 pounds. but you’ll probably have to install an aftermarket pad. With regard to ordering other Browning parts, you’ll find that the key numbers on the schematic drawing on page 5 are not sufficient; you’ll need to know the actual Browning part number. Since so many parts are caliber-specific, a list of all part numbers would cover much more space than we have in these pages. You can, however, get a parts list by calling Browning or