[6] Official correspondence between Major Louis R. Burgess, commander of the Artillery District of Mobile (Alabama), and senior Ordnance Corps officers began in December 1912.

Payne of the 164th Company was noted, with the remark "the lateral kick and vibration of the carriage upon recoil is destructive to the morale of the gun pointer".

The lights provided for night firing also tended to become unscrewed, and the lamps for the sight's deflection scale were overly bright, apparently interfering with observation of the target.

In March 1913 the ordnance officers considered disabling the carriage in the up position by partially filling it with concrete.

[8] The disabling of carriages had little negative impact; the weapon was small enough that the risk of observation from the sea was minimal.

[10] In March 1920 the ordnance and coast artillery leadership determined that the M1898 should be declared obsolete and removed from service.

[12] In November 1931 the guns were declared obsolete, with many being donated to communities as war memorials and the rest scrapped.

Two guns were in a massive casemated emplacement named Battery Edwards, converted from an 1870s magazine.

It was designed for a fixed mounting and remained in service, primarily at Coast Artillery installations, through World War II.

The new weapons were called Anti Motor Torpedo Boat (AMTB) guns.

Almost all remaining weapons, including the new 90 mm guns, were scrapped shortly after the war ended in 1945–48.

Thus connected, complete motion of the operating lever to the right will cause the breechblock to rotate and to be swung clear of the breech recess.

The entire weight of the gun and top part of the carriage rests upon this ring of ball bearings.

The opening for the gun in the shield is prolonged underneath to allow for the removal of the piston and springs from the recoil cylinder.

To load, push the shell home into the breech recess of the gun with a moderately quick motion of the hand.

The propelling charge is assembled loosely in the cartridge case which is crimped rigidly to the projectile.

[3] Dependent upon the type of projectile, ammunition for these guns is classified as high explosive, target practice, blank, or drill.

The blank ammunition has a black powder (low explosive) charge in the cartridge case and no projectile.

[3] All projectiles are painted to prevent rust and corrosion and by the color to provide a ready means of identification as to type.

[3] Specifications from TM 9-421[3] Traverse dependent upon construction and emplacement[3] At least 23 3-inch seacoast guns, four mountings, and two training dummies survive:[23][13][14]