Best Ammo for 9mm Carbines: PC Carbine, Scorpion and Sub-2000

Same cartridge, different gun

A 9mm round fired from a 4-inch pistol and the same round fired from a 16-inch carbine aren't quite the same thing when they hit. The longer barrel gives the burning powder more time to push, so the bullet usually arrives faster. For range ammo, that's mostly a bonus. For hollow points, it changes the math.

Hollow points are engineered to expand within a velocity window. Designers usually build 9mm defensive bullets around pistol barrels. Give them extra speed and some designs open faster and penetrate less than the maker intended. That's not a defect, just a mismatch.

The other difference is mechanical. Most popular pistol-caliber carbines, including the three in this guide, are blowback-operated. That affects which practice ammo runs smoothly.

The three carbines in this guide

The Ruger details come from Ruger's model page and the carbine's reference entry. Scorpion and Sub-2000 details come from their reference entries.

Why blowback cares about your ammo

In a blowback gun, nothing locks the bolt to the barrel. The bolt's mass and the recoil spring hold the action closed while pressure drops, and the cartridge's push is what drives the bolt back. The designs differ: Ruger's PC Carbine puts part of the bolt's weight in a separate block under the forend, while the Sub-2000 runs its spring in the stock tube.

That means two things for ammunition:

• Too little push can mean short-stroking. Very light or reduced-power loads may not drive the bolt back far enough to pick up the next round. Most standard-pressure 115 and 124 grain FMJ runs fine, but test before you buy in bulk.
• Heavy bolts move a lot. Blowback carbines can feel snappier than you'd expect for a 9mm, and they tend to get dirty faster. Clean, consistent ammo helps.

Best defensive loads for 9mm carbines

The carbine-specific pick

This is the cleanest answer to the over-expansion question. Speer took its bonded Gold Dot design, which holds jacket and core together, and tuned it for carbine-length barrels, while the listing also emphasizes reliable cycling. A load built for your barrel length is better than one designed for a different gun.

The heavy, tough duty load

A heavier bullet starting slower gains speed in a long barrel but generally stays in a more forgiving zone than a light, fast one. The 147-grain HST is also listed for suppressed use, which matters to carbine owners with threaded barrels.

Also worth considering

• Hornady Critical Duty 135 gr. Its tougher FlexLock bullet was designed for barrier work from full-size pistols. Some carbine owners like that tougher construction, but confirm cycling in your gun.
• Speer Gold Dot 124 gr +P. A bonded bullet, but already a fast +P load. Only use +P if your carbine maker approves it, and expect higher velocity from the long barrel.

Best range ammo for 9mm carbines

For practice, the goal is clean, reliable cycling in a blowback action at a fair cost per round.

Other options at Ammunition Depot: Blazer Brass 115 gr FMJ is the common lighter load, and Speer Lawman 115 gr TMJ has a fully enclosed base, which some shooters like for indoor ranges. Browse the 9mm section for more choices.

Steel case and remanufactured ammo

Many carbines run steel-cased 9mm, but blowback actions can be fussier about extraction with some steel cases. Remanufactured ammo can be fine for practice, but quality varies by maker. Our brass vs steel guide covers the trade-offs; test a box first either way.

Suppressed carbines

Many pistol-caliber carbines, including the PC Carbine models with threaded barrels, are popular hosts for suppressors where they're legal to own. Two ammunition points matter if you shoot one that way.

First, 9mm loads that are supersonic from a pistol can stay supersonic from a 16-inch barrel, which brings back the crack of a bullet breaking the sound barrier. Heavier 147-grain loads start slower and are the usual choice for quieter shooting. Ammunition Depot's listing for the 147 gr HST includes suppressed use, and our subsonic vs supersonic explainer covers the physics.

Second, a suppressor adds back-pressure, which can make a blowback action cycle harder and get dirtier faster. Test your loads with the suppressor on, and clean more often.

Common carbine ammo mistakes

Buying "carbine" ammo for a pistol. The Gold Dot Carbine load is tuned for long barrels. In a pistol it gives up the velocity it was designed around. Use a pistol-tuned load in a pistol.

Assuming +P is better. In a carbine, the long barrel already adds velocity. Hotter loads can push light bullets past their design window and add wear to a blowback action. Only use +P if your carbine's manufacturer approves it.

Skipping the magazine check. Carbines that use pistol magazines inherit the quirks of those magazines. A worn pistol magazine that's fine in a pistol can cause feeding issues in a carbine, and vice versa.

Forgetting the optic. Most carbines wear a red dot. Different bullet weights can shift point of impact, so zero with the load you plan to use for defense.

Gun-by-gun notes

Ruger PC Carbine

The PC Carbine's interchangeable magazine wells let you run Ruger SR-Series/Security-9 or Glock magazines. Ruger notes that early Glock magazines with a U-shaped notch at the rear of the feed lips won't function. If you share magazines with a Glock pistol, test your carry load in both guns.

CZ Scorpion carbine

The Scorpion carbine's 16.2-inch barrel puts it in the same velocity bracket as other 16-inch carbines. If you own the pistol version with its much shorter barrel, regular pistol-tuned defensive loads are a better match. Spare CZ Scorpion magazines are worth having for testing.

Kel-Tec Sub-2000

The Sub-2000 folds in half and can't fire while folded. It uses magazines from popular pistols depending on the version. Because it's light, recoil can feel sharper than in heavier carbines. Test any defensive load for reliable feeding from your chosen magazines.

Quick picks

Before you trust it

1. Fire enough of your defensive load to be confident it feeds, fires and ejects from every magazine.
2. Confirm the point of impact. A carbine with an optic may print differently with 135-grain and 115-grain loads.
3. Clean a blowback carbine more often than you would a pistol; it gets dirty quickly.
4. Store the carbine and its ammo securely.

Editorial note: This is an independent editorial overview built from manufacturer specifications, retailer listings and published sources. We have not performed hands-on testing of the products discussed, and nothing here is a performance guarantee. Verify specifications, compatibility and the law where you live.

Affiliate disclosure: Some links on this page are affiliate links to Ammunition Depot. We may earn a commission if you buy through them, at no extra cost to you. Our editorial choices are not influenced by commissions. Check current price, stock and specifications directly with the retailer.