Married Rosetta Corri on May 1, 1856 in the presence of Valentina Corri and Mr. M.S. Callaghan, in the parish of St. Mark, Dublin.

George took over the business in 1853 and in 1854 formed a partnership with his brother-in-law, Joseph Harriss.

The business then became known as 'Trulock and Harriss' and continued trading under this name until 1890.

A Treatise on Ordnance and Armor by Alexander L. Holley B.P.

[extract ] ... I soon found that it was dangerous to fire such heavy projectiles from cast-iron guns with full service charges, and thus it happened that my attendtion was directed, at such an early date, to strengthening these guns. I had, at some time previusly, witnessed the manufacture of wrought-iron twist barrels at the forge of Messers. Truelock and Harris, gunmakers, of Dublin, and at the same time was informed of the great strength that was acquired by this mode of manufacture. I commenced my first experiments in September 1854, by casting some small cast-iron guns over tubes of wrough iron similarly constructed. I found that guns made in this manner were enormously strong, and, in fact, that they could not be burst my any fair means... Read More »

Journal of Royal United Service Institution, Speaker, Major William Palliser, Late 18th Hussars

[extract] ... I had previously watched the manufacture of twist, or, as they have since been called, "coiled" wrought-iron barrels at the forges of Messers. Truelock and Harris, gunmakers of Dublin, and had learned from them the great strength derived from this process of manufacture, and I commenced my experiments by casting several small cannon round wrought-iron twist barrels, in the same manner as I still propose to construct heavy guns... Read More »

The Shotgun and Sporting Rifle, John Henry Walsh

Messers Trulock and Harris of Dublin have invented a little machine which does away with all the objections which can be urged, for it confines the wad in its place whatever may be the charge and length of case. All that is necessary is to have the cases cut to the proper length of the chamber, the load in the the usual way, and inserting the cartridge into a circular slit (see a & b in figure) in which is a plug (c), push it down till the wad touches the plug, when pressing the lever (d) against the cartridge, this is turned around until a dent is made in it above the wad, as shown at (e & e). By this plan the shot has no interval to pass over between the end of the case and the shoulder of the chamber, this space being filled up by the cartridge case. No plan I have seen yet is as good as this, in my opinion and I find that in prectise is acts remarkably well. Read More »