Description
This is the genuine Winchester Invector-Plus Full choke tube, cut from 17-4 stainless steel and designed to sit flush in the muzzle of your back-bored 12 gauge. The Full constriction is the tightest of the common field chokes, which means it holds the shot column together longer and puts a dense pattern where you need it when the birds or targets are stretching things out past 40 yards.
What the Invector-Plus System Brings to the Table
Winchester pioneered the screw-in choke concept decades ago, and the Invector-Plus design pairs with the gun's back-bored barrel to cut down on shot deformation. The longer internal taper is the key here. It eases the shot into the constriction gradually, which produces more uniform density and fewer stray fliers on the pattern board. The tube also seals off gas that would otherwise slip between the choke and barrel, so you get cleaner performance and less wear over the long haul.
Where This Full Choke Earns Its Keep
A Full choke is built for reach. Think pass-shooting ducks and geese, distant doves, or a rooster pheasant that flushed way out of range for a lighter tube. It also shines on close-in situations where a tight core matters. Keep in mind this tube is set up for lead loads, so match your shells accordingly for the best results.
Fitment for Your Winchester Invector-Plus Choke
This flush tube fits 12 gauge Winchester shotguns threaded for Invector-Plus, including the SX2, SX3, SX4, SXP, Supreme, Select, and Model 101. Since it's the same threading Browning uses on their Invector-Plus guns, it crosses over to those as well. The flush design keeps a clean profile at the muzzle and the 17-4 stainless build stands up to thousands of rounds without losing its constriction. If you're rounding out a choke set or replacing a tube you lost in the truck bed, this is the factory piece that keeps your gun patterning the way Winchester intended.
Key Specifications
- Manufacturer: Winchester
- Manufacturer Part Number: 613051
- UPC: 048702186059
- Series: Invector-Plus
- Gauge: 12 Gauge
- Constriction: Full
- Mount Type: Flush
- Material: 17-4 Stainless Steel
- Finish: Black
- Diameter: 0.705 in
- Degree of Constriction: 0.030 in
- Recommended Range: 40+ yards
- Shot Type: Lead
- Weight: 3.2 oz
- Chokes Included: One Choke
What’s Included
- (1) Winchester Invector-Plus Full flush choke tube
Frequently Asked Questions
Which shotguns does this Invector-Plus Full choke tube fit?
It fits 12 gauge Winchester shotguns threaded for the Invector-Plus system, including the SX2, SX3, SX4, SXP, Supreme, Select, and Model 101. Because it shares the same threading as Browning's Invector-Plus guns, it also works in those. It will not fit older standard Invector barrels, so make sure your gun is specifically an Invector-Plus.
What is a Full choke best used for?
Full is the tightest of the everyday field chokes, so it's built for longer shots where you want the shot column to stay together. That makes it a solid pick for pass-shooting waterfowl, distant doves, and birds that flush out of range for lighter tubes. It's generally recommended for targets around 40 yards and beyond.
Can I shoot steel shot through this Full choke tube?
This particular tube is set up for lead loads, so that's what you'll want to run through it for the best results. If you're chasing waterfowl and need non-toxic shot, look for a choke rated specifically for steel. Matching your load to the choke keeps both the tube and your barrel happy.
Is this a flush-mount or extended choke?
This is a flush-mount tube, meaning it sits even with the end of the barrel for a clean, snag-free profile. You'll need a choke wrench to install and remove it since there's no extended portion to grip by hand. The flush design is the classic look most Winchester field guns ship with.





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