Description
When you need your 20 gauge to reach out and hit hard, a Full choke is the tool for the job. Carlson's 51204 is a flush-mount Full constriction built for Remington Rem Choke shotguns, squeezing that shot column down to roughly a .590 inch exit diameter for a dense, tight pattern. That extra reach is exactly what you want when the birds are hanging back or a rooster flushes wide, and it's a favorite for pass-shooting ducks, late-season pheasants, and stretching your effective range on the trap field.
What the Carlson's Full Choke Brings to the Table
This one is CNC-machined from 17-4 heat-treated stainless steel, which is the same material Carlson's uses across their flush-mount lineup. Stainless holds up to weather, plastic wad fouling, and years of screwing in and out without galling the threads. The flush design sits even with your muzzle, so nothing sticks out to catch on a blind bag or gun case, and it keeps the balance of your shotgun feeling the way the factory intended.
Fit and Compatibility for Your Remington 20 Gauge
If your 20 gauge is threaded for the Remington Rem Choke system, this tube threads right in. That covers a huge chunk of pumps and autos out there, including the 870, 1100, and 11-87 in 20 gauge, along with plenty of other guns that share those Rem Choke threads. Lead shot runs fine through the Full constriction. If you're shooting steel, stick to BB and smaller sizes through a Full choke and keep the bigger steel loads in a more open tube.
Built to Last and Backed for Life
Carlson's has been patterning shotshells and refining choke geometry for over three decades, and it shows in how consistently these tubes throw. Every Carlson's choke is proudly made in the USA and carries a lifetime warranty, so if anything ever happens to it, they'll take care of you. Grab a choke wrench if you don't already have one, keep the threads clean and lightly lubed, and this Full choke will earn its keep for a long time.
Key Specifications
- Manufacturer: Carlson's Choke Tubes
- Manufacturer Part Number: 51204
- UPC: 723189512040
- Gauge: 20 Gauge
- Constriction: Full
- Exit Diameter: 0.590 in
- Style: Flush Mount
- Porting: Non-Ported
- Choke System: Remington Rem Choke
- Material: 17-4 Heat-Treated Stainless Steel
- Finish: Stainless / Silver
- Country of Origin: Made in USA
- Warranty: Lifetime
What’s Included
- One Carlson's 51204 Full flush choke tube for Remington 20 gauge
Frequently Asked Questions
What shotguns does the Carlson's 51204 Full choke fit?
It fits 20 gauge shotguns threaded for the Remington Rem Choke system. That includes popular guns like the Remington 870, 1100, and 11-87 in 20 gauge, plus other makes that use the same Rem Choke threads. If you're unsure, check your existing choke or your owner's manual for the Rem Choke designation.
Can I shoot steel shot through this Full choke tube?
Lead shot is fine through all constrictions including Full. With steel, stick to BB and smaller sizes through a Full choke and avoid running larger steel loads through the tighter constrictions. For heavier steel payloads, step down to a more open choke like Modified.
What's the difference between the Full and Modified choke for my 20 gauge?
The Full choke has a tighter constriction, which keeps your pattern denser at longer distances for more reach on birds hanging back or clays thrown far. Modified opens things up a bit for closer, faster targets. If you're doing a lot of pass-shooting or late-season hunting, the Full is the one you want.
Do I need a special wrench to install the Carlson's choke tube?
Yes, a Rem Choke wrench makes install and removal easy and helps you seat the tube fully without cross-threading. The wrench is not included with this choke, so grab one if you don't already have it. Always make sure your shotgun is unloaded before swapping chokes.




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