Out of stock
SKU: 20GAIMPMOD
UPC: 796167791256
MPN: 20GAIMPMOD
The Iver Johnson Choke Tube 20ga. - Improved Modified Mobil Choke (MPN 20GAIMPMOD) is a replaceable steel choke for 20-gauge shotguns built on the Benelli/Beretta Mobil thread pattern. The IM constriction sits between Modified and Full, which means it throws a tighter pattern than a Modified tube while still spreading wider than a Full. That makes it a working choice for hunters and clay shooters who need to reach a little farther without choking down to Full. If your 20-gauge runs a Mobil-pattern threaded barrel, this tube drops in and screws down flush. Browse the rest of our choke tube selection for matching constrictions.
This choke is machined from steel and cut to the Benelli/Beretta Mobil thread spec, so it fits any 20-gauge shotgun designed for that interface. The Improved Modified designation tightens the shot string compared to a Modified tube, holding pellets together longer downrange for cleaner hits on birds and targets at extended distance. It carries UPC 796167791256 and ships at roughly 0.05 lbs. Iver Johnson cuts these tubes across the common constrictions, so shooters who run multiple loads can keep a set on hand and swap as conditions change. If you want a looser pattern for closer work, the 20ga Modified or the 20ga Skeet tube in the same Mobil pattern give you the next steps down.
Reach for this IM tube when you need pattern density at medium range — late-season upland birds flushing wide, doves at the edge of effective range, or trap from the longer yardage where a Modified opens up too much. It threads into Mobil-pattern 20-gauge barrels and runs flush with the muzzle, so there is no extension to snag in the field. Shooters who run a 20-gauge alongside a 12 can keep their patterns consistent across both. Pair it with a tube case to keep a full set protected, and check our wider choke tube category for Mobil, Invector, and Rem Choke fitments.
IM stands for Improved Modified. It is a constriction that falls between Modified and Full, producing a tighter shot pattern than a Modified tube but a slightly wider spread than a Full choke. It suits medium-range shooting where you need more pattern density without going all the way to Full.
This tube is cut to the Benelli/Beretta Mobil thread pattern, so it fits any 20-gauge shotgun built for that interface. Confirm your barrel uses the Mobil pattern before ordering, since Invector, Rem Choke, and other systems use different threads.
Yes. The IM constriction works well for medium-range upland and waterfowl situations where birds flush or pass a bit farther out. It holds the shot string together longer than a Modified tube, giving you denser patterns at extended distance while staying more forgiving than a Full choke.
It is machined from steel per manufacturer specifications, which holds up to repeated installation and removal and stands up to standard 20-gauge loads. Keep the threads clean and lubricated for easy swaps between constrictions.
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