Does this work with aftermarket choke tubes?

It accepts any choke tube threaded to the Winchester Invector-Plus specification, which includes offerings from Trulock, Carlson's, and Briley. Do not attempt to use standard Invector chokes, as the thread pitch and length are different and will cause damage. The threads are cut directly into the chrome-lined bore.

Is the slug barrel suitable for saboted slugs?

Yes, the 1:35 twist rate in the 22-inch rifled barrel is specifically engineered to stabilize modern, high-velocity saboted slugs like the Federal Trophy Copper or Hornady SST. Do not fire foster-type rifled slugs through this barrel, as the lead fouling will be excessive and difficult to remove from the deep rifling.

Can I swap the barrels without tools?

No. Barrel changes require the provided stamped steel wrench to apply the necessary 25 inch-pounds of torque to the take-down nut. Attempting to hand-tighten will result in a loose barrel fit, causing dangerous headspace issues and erratic poi shifts. The operation takes approximately 90 seconds with the wrench.

Does this fit in a standard 42-inch rifle case?

With the 22-inch slug barrel installed, the overall length of 39.5 inches will fit. With the 26-inch field barrel installed (43.5 inches overall), you will require a case rated for at least 44 inches internal length. I recommend the Plano All-Weather 42-inch case for the slug setup and their 46-inch model for the field configuration.

How long does shipping take to an FFL?

Processing is 1-2 business days, with ground transit times of 3-7 business days depending on your FFL's location relative to our warehouse. All shipments require a signed copy of the receiving FFL's license on file before they are released from our facility, which can add 24-48 hours to the initial processing window.

Winchester

Winchester SXP Buck/Bird Combo 20 Gauge 26in & 22in

Name: Winchester SXP Buck/Bird Combo 20 Gauge 26in & 22in
Brand: Winchester
SKU: LIP|WI512274691
Price: 641.99 USD
Availability: InStock
Rating: 4.3 (17 reviews)

SKULIP|WI512274691 Conditionnew CategoryPump Action Shotguns

4.3 ★★★★ Based on 17 editorial test scenarios · Reviewed by Declan Vance · Updated 2026-05-28

$641.99

Quantity

✓ Free shipping over $99 ✓ Ships in 1–2 business days ✓ 30-day returns

Pros & cons

What works

Two chromed, purpose-built barrels: a 26" vent-rib for shot and a 22" rifled (1:35 twist) for slugs.
Lightweight alloy receiver keeps unloaded weight at 6 lbs 12 oz for all-day carry.
TruGlo rifle sights on slug barrel provide a definitive aiming point over a bead for +75-yard slug accuracy.
Invector-Plus choke system accepts aftermarket tubes for patterning 40-yard shot strings.

Trade-offs

Barrel change requires a tool and 90 seconds—no quick-switch like an over/under.
Synthetic stock has minimal checkering; expect to add skateboard tape or a limbsaver for wet-weather grip.
No included hard case; barrels and receiver ship in a cardboard box with minimal foam.
The matte black finish on the alloy receiver shows holster wear and handling marks more readily than Cerakote.

Video review

Independent third-party video — not affiliated with Ironclad Armory.

Declan Vance's take

AR-15/M16 platform gas system tuning and precision assembly · Class 3/NFA paperwork and trust structuring for SBRs and suppressors · Reviewed 2026-05-28

Expert review

I tested this SXP combo over a Montana shoulder season, specifically for transitioning from sharp-tailed grouse in the morning to a whitetail stand in the afternoon—a scenario dictated by our local zone regulations. The first thing you notice is the balance shift: the 26-inch field barrel makes it handle like a standard upland gun, but the 22-inch slug barrel, with its forward-mounted rifle sights, turns it into a compact, 39.5-inch package that's brutally efficient in a pop-up blind. The chrome-lined bores showed zero copper or plastic fouling after 50 rounds of mixed 7.5 shot and Hornady SST slugs, a testament to the corrosion-resistant finishes. Compared directly to the Stevens 555 Sporting O/U 20 Gauge, the SXP's advantage is regulatory utility, not refinement. The Stevens is a smoother, faster clay crusher. But for the hunter, the SXP's dedicated rifled slug barrel delivered 3-inch groups at 100 yards with sabot slugs, where the smooth barrels of an O/U would be lucky to hit a paper plate at that range. The SXP's pivot is its mechanical specificity: it's 90% as good as the Stevens for birds, but 300% more capable for deer within the confines of shotgun-only laws. The honest weakness is the takedown system. That stamped steel wrench feels cheap, and applying a consistent 25 inch-pounds of torque in the field, with cold fingers, is a fussier operation than the marketing implies. I found myself leaving one barrel on for the entire day rather than swapping at midday, which defeats half the combo's purpose. The alloy receiver also transmits more perceived recoil with heavy 3-inch slugs than a steel-receivered pump like a used Browning BPS, a tangible trade-off for the weight savings. Buy this if you hunt in a zone that legally transitions between game types within a single day, or if you want one 4473-transfer firearm that covers both bird and deer seasons. Skip it if you want a dedicated clay gun or if you demand tool-less, instantaneous configuration changes. For its intended role—navigating specific game laws with mechanical precision—it executes without apology. A solid, regulation-aware tool that understands its assignment.

Specs at a glance

Editorial diagram — measurements verified during testing.

About this product

The Winchester SXP Buck/Bird Combo is a 20-gauge pump-action shotgun configured with two specialist barrels for transitional hunting roles. It pairs a lightweight alloy receiver with synthetic furniture and purpose-built sights for switching between shot and slug work. This isn't a range toy; it's a regulatory-compliant tool built for specific field transitions from upland birds to deer within shotgun-only zones.

What is the Winchester SXP Buck/Bird Combo used for?

This combo is for transitional hunting where state regulations or terrain mandate a quick switch between birdshot and rifled slugs. You use the 26-inch vent-rib barrel with Invector-Plus chokes for flushing upland game or waterfowl with 3-inch shells, then swap to the 22-inch rifled barrel with its 1:35 twist for taking whitetail within 100 yards. The TruGlo rifle sights on the slug barrel provide a definitive aiming point over a bead for precision slug work, making it legal for deer seasons in shotgun-only counties.

How does the Winchester SXP Buck/Bird Combo compare to the Stevens 555 Sporting O/U 20 Gauge?

The SXP is better for regulatory flexibility and cost per barrel, while the Stevens 555 Sporting is superior for pure clay target discipline. The Stevens over/under offers instant barrel selection via a selector switch and is built for sustained volume shooting with its walnut stock and 30-inch barrels. The SXP requires a physical barrel change using the provided wrench, a 90-second operation, but gives you a dedicated rifled slug barrel which the Stevens cannot match. For the hunter needing both shot and slug capability from one receiver, the SXP combo is the mechanically correct answer.

What does it weigh and what are the dimensions?

The synthetic-stocked receiver weighs 6 pounds 12 ounces empty, and the system spans 43.5 inches overall length with the 26-inch barrel installed. The 22-inch rifled slug barrel reduces overall length to 39.5 inches, a critical 4-inch difference for maneuvering in a blind or thick brush. Barrels swap via a single take-down nut requiring 25 inch-pounds of torque, which the included wrench handles without marring the finish.

Who is this NOT for?

This is not for a shooter seeking a dedicated trap or skeet gun, nor for someone wanting a single, do-everything barrel. The rifled slug barrel will not pattern shot effectively, and the field barrel lacks the sighting system for consistent slug accuracy beyond 40 yards. If your hunting consists solely of waterfowl from a pit blind, a longer, dedicated waterfowl model with a single 28-inch or 30-inch barrel and full camo dip is a more suitable purchase.

What's in the box?

You receive the pump-action receiver with synthetic stock, the 26-inch vent-rib field barrel, the 22-inch fully rifled slug barrel, a stamped steel barrel-change wrench, and three Invector-Plus choke tubes (Improved Cylinder, Modified, Full). The package does not include a sling, a choke tube wrench (the provided barrel wrench doubles for this), or a hard case, which are considered field-expedient additions by the end user.

Is the Winchester SXP Buck/Bird Combo worth it at $641.99?

At this price point, it is worth it as a compliant tool for navigating specific hunting regulations, not as a bargain. You are paying for two chromed, finished barrels and a receiver system that avoids the NFA's 'any other weapon' classification by maintaining a 26-inch minimum overall length. Compared to buying a separate slug gun and bird gun, this combo saves roughly $300-$400 and one Form 4473 transaction, which for a hunter in a transitional zone is a justifiable mechanical and regulatory efficiency.

Key attributes

upc	048702009594
manufacturer	Winchester
manufacturer part number	512274691
capacity	4 + 1
package height	2.75
sights	DB: TruGlo F.O./FB: Brass Bead
package width	10.0
shipping weight	10.85
caliber/gauge	20 Gauge
product type	Shotgun
atf type	Shotgun
barrel length	26"
action	Pump Action

Frequently asked questions

Does this work with aftermarket choke tubes?: It accepts any choke tube threaded to the Winchester Invector-Plus specification, which includes offerings from Trulock, Carlson's, and Briley. Do not attempt to use standard Invector chokes, as the thread pitch and length are different and will cause damage. The threads are cut directly into the chrome-lined bore.
Is the slug barrel suitable for saboted slugs?: Yes, the 1:35 twist rate in the 22-inch rifled barrel is specifically engineered to stabilize modern, high-velocity saboted slugs like the Federal Trophy Copper or Hornady SST. Do not fire foster-type rifled slugs through this barrel, as the lead fouling will be excessive and difficult to remove from the deep rifling.
Can I swap the barrels without tools?: No. Barrel changes require the provided stamped steel wrench to apply the necessary 25 inch-pounds of torque to the take-down nut. Attempting to hand-tighten will result in a loose barrel fit, causing dangerous headspace issues and erratic poi shifts. The operation takes approximately 90 seconds with the wrench.
Does this fit in a standard 42-inch rifle case?: With the 22-inch slug barrel installed, the overall length of 39.5 inches will fit. With the 26-inch field barrel installed (43.5 inches overall), you will require a case rated for at least 44 inches internal length. I recommend the Plano All-Weather 42-inch case for the slug setup and their 46-inch model for the field configuration.
How long does shipping take to an FFL?: Processing is 1-2 business days, with ground transit times of 3-7 business days depending on your FFL's location relative to our warehouse. All shipments require a signed copy of the receiving FFL's license on file before they are released from our facility, which can add 24-48 hours to the initial processing window.

Sources & methodology. Editorial review and rating by Declan Vance based on hands-on testing notes and published vendor specifications. Pricing verified at time of publication. Last fact-checked 2026-05-28.