The Geissele 5.56 Suppressor Alignment Gage (Geissele part no. 10-259-F) is a precision steel rod built to check bore-to-thread concentricity on a 5.56 upper before you thread on a suppressor or muzzle device. Machined to a true 15.5-inch length, it runs far enough down the bore to catch alignment problems a shorter gage would miss, helping you confirm the barrel extension and muzzle threads are cut true before you spend money on a can. It is a shop tool, not a suppressor or muzzle device itself, and it will not ship directly to California addresses. Armorers and suppressor owners use it as a quick pass or fail check before committing to a direct-thread mount.

Key Specifications

• Machined from steel for a rigid, accurate gage that will not flex during a check.
• Finished in black for a durable, low-glare surface.
• Measures a true 15.5 inches long, long enough to catch concentricity issues down the bore.
• Sized at 0.8 inches wide by 0.95 inches tall, matching standard 5.56 bore-adjacent clearances.
• Cannot ship directly to California addresses under current distributor restrictions.

Frequently Asked Questions

Is this gage itself a suppressor? No, it is a steel alignment tool used to check bore and thread concentricity before mounting a suppressor; it is not a regulated NFA item.

Can this ship to California? No, this item cannot ship directly to California addresses.

Buy the Geissele 5.56 Suppressor Alignment Gage

Check your alignment before you thread on a suppressor, not after. Order this gage from our Lubbock, Texas gun shop and it ships fast, direct to your door outside of California, with no FFL required for a shop tool like this one. Shop more from Geissele Automatics or browse our suppressor accessories selection for more mounting tools.