CVA 209 In-Line Breech Plug AC1678 Stainless Steel Replacement

Description

Breech plugs are one of those parts that quietly do a ton of work every time you touch off a charge, and after enough shots they start to show it. This is the CVA AC1678, a stainless steel 209 breech plug built to the same design and quality that came standard on CVA's older in-line and bolt-action rifles. If your original plug has been through years of magnum loads, pitting, or primer channel wear, this is the direct swap that gets you back to clean, consistent ignition.

It's set up for standard 209 shotgun primers and machined with a hex head so you can back it out and torque it down with a breech plug wrench. The stainless construction is the part that matters most day to day, since it stands up to the corrosive fouling that black powder and substitutes leave behind far better than plain steel would.

What the AC1678 Fits

This plug is made for a long list of pre-2010 CVA 209-capable guns. That covers the Buckhorn, Eclipse, Eclipse Hunter, Stag Horn, Magbolt 150, Firebolt, Firebolt Ultramag, Hunterbolt, and Magnum Hunter. It's built for most conventional in-line and bolt-action CVA muzzleloaders already running 209 ignition, so it's a matched part rather than a universal guess. Worth noting it won't convert a #11 cap or musket cap gun over to 209 on its own, and it isn't the quick-release style used on the newer break-action Accura, Optima, and Wolf rifles.

Keeping Your CVA In-Line Running Right

Honest maintenance advice from folks who shoot these: a breech plug is a wear item. Heavy magnum loads put real pressure on it, and over a couple seasons you can get blow-by as the primer channel widens or pits. Swapping in a fresh AC1678 restores that tight seal, keeps your ignition snappy, and takes the guesswork out of an offhand shot on a cold morning. Pair it with anti-seize on the threads and it'll come out easy next cleaning.