Reassembling Your Browning BPS After Cleaning the Magazine Tube

After a thorough strip-down and clean of your Browning BPS pump-action, the moment arrives when the field stock, blued barrel, and magazine tube need to come back together. Many Australian owners keep their shotguns in peak condition because the BPS is a favourite for sambar deer, feral pigs, and the odd morning at the dam shooting waterfowl. Putting the action back together correctly matters just as much as the cleaning itself, because a poorly seated magazine tube can cause feeding issues or, worse, a safety concern down the track.

Aussie shooters know the value of a reliable tool. Whether your BPS is stored in a gun safe in Ballarat or behind the back seat of the ute on a station near Longreach, reassembly needs to be methodical. Rushing this step is how people end up with a spring coiled the wrong way or a magazine cap that won't lock. Take your time, work on a clean mat, and follow the steps in order.

This walkthrough assumes you've already field-stripped the firearm and cleaned each part. If you need a refresher on the disassembly side, a technical reference can help clarify the order of operations before you begin.

Preparing the Magazine Tube and Components

Before touching the shotgun again, lay every part out on a lint-free cloth in the order they came off. The BPS magazine tube is the long steel cylinder beneath the barrel that holds the shells, and it needs a quick once-over for any leftover solvent or fibre patch residue. Aussie humidity can leave a faint film on steel, so a dry microfibre cloth is handy to give the tube a final wipe.

Check the inside of the tube for any pitting or rust spots, particularly if you've been hunting in coastal scrub around Margaret River or the wet forests of Gippsland. Light surface wear is normal, but anything that catches your fingernail deserves a closer look. Now is also a good time to confirm you've got the correct magazine spring for the calibre of your BPS — 12-gauge and 20-gauge springs are not interchangeable, and mixing them up is a common mistake among newer owners.

Inspecting the Magazine Spring and Follower

The follower is the plastic or metal piece that pushes shells up toward the chamber, and the spring sits behind it under tension. Give the spring a visual check for kinks, stretched coils, or corrosion. If you spot any of these, replace the spring before reassembly — chasing a misfeed in the bush is no fun. Followers wear down over years of use, and a cracked or deformed follower should be swapped out too.

While you're at it, make sure you know which way the spring sits in the tube. The smaller-diameter end typically goes in first, but always match it against the orientation you noted during disassembly. Australian owners who shoot heavy 32-gram loads for waterfowl will put more stress on these parts than someone using light target loads, so the inspection is worth the few extra minutes.

Aligning the Magazine Tube with the Receiver

The magazine tube threads into the receiver at the rear and the magazine cap screws on at the front. Start by feeding the tube and spring assembly back into the receiver end first, making sure the lug on the tube aligns with the slot inside the action. This is the step where patience pays off. If the tube doesn't slide in smoothly, stop and check for misalignment rather than forcing it. Forcing a magazine tube can damage the threads or bend the spring.

Thread the tube in by hand until it's snug, but don't tighten it fully yet. You'll want a small amount of play to ensure the barrel and magazine tube are properly mated when you reattach the barrel. Australian dealers at your local firearms store can show you this step in person if you're uncertain, and many will walk you through it during a handover.

Securing the Magazine Cap and Retaining Components

With the tube aligned, the magazine cap goes on next. This is the knurled end cap that holds the spring under compression. Hand-tighten it first, then give it a final snug with a proper tool — never use pliers that could chew up the knurling. The cap should be firm but not gorilla-tight. Overtightening can warp the cap or strip the threads.

If your BPS has the sling swivel stud or magazine cap retainer, refit that now. This is also a good moment to check the magazine cap seal, which keeps debris out of the tube. A cracked or hardened seal is a cheap fix that prevents bigger headaches later, especially for anyone hunting in the red dust of the Kimberley or the sandy conditions of the Simpson.

Function-Checking the Pump Action

Once everything is back together, perform a function check without ammunition. Rack the forearm back and forth a few times. It should move smoothly with no binding or grinding. The action bars should glide without lateral wobble. If you feel grit or resistance, stop and find the cause — don't just keep pumping.

Cycle the safety on and off, and dry-fire the gun in a safe direction (a backstop is ideal). Confirm the trigger breaks cleanly and the hammer falls. If your BPS has a cross-bolt safety on the trigger guard, check that it blocks the trigger properly. Australian owners who keep their guns stored in accordance with state regulations — such as Category A and B licensing in NSW or Victoria — will already have a safe and cleared area set aside for exactly this kind of check.

Lubrication and Final Safety Checks

A light coat of quality gun oil on the magazine tube threads, the action bars, and the magazine cap threads will keep things moving smoothly. Avoid heavy grease inside the magazine tube itself, as it can attract dust and lint. Wipe down the outside of the barrel and receiver, and you're almost done.

Store your reassembled BPS in a way that suits Australian conditions. If you're in a humid area like Cairns or Townsville, a dehumidifier rod or silica gel packs in the safe are a smart idea. Run a final visual inspection to confirm nothing is loose, and you're set.

Practical Tips for a Smooth Reassembly

• Photograph each stage of disassembly with your phone so the reassembly order is obvious.
• Keep a small parts tray handy to stop springs from rolling under the workbench.
• Use a torque wrench or a marked strap wrench for the magazine cap if you tend to over-tighten.
• Replace the magazine tube seal every few years as preventive maintenance.
• Cycle the action a dozen times after reassembly to confirm everything is seated.
• Store your BPS in a compliant gun safe that meets your state or territory requirements.
• Keep a copy of the owner's manual in a dry bag in case you need it in the paddock.

If you need replacement parts, accessories, or want to browse the current range of Browning shotguns, swing past the cart to start an order, and if you ever get locked out of your account while tracking a shipment, the password recovery page will get you back in. Happy shooting, and take care out there.