At the end of the 1800's, Alfred Gray Parker is listed with an address at 69 ickneild street and by 1910,their logo has altered to A G Parker & co ltd , at 264 ickneild st.
In 1915 the fim has moved to 61/2 Whittall St where they have added GUN IMPLEMENTS to their range and by 1920,additional premises have been found and the address becomes BISLEY WORKS Whittall st. By 1935 the firm can no longer be found under the entries for GUN ,RIFLE and PISTOL MAKERS; they are now classed as GUN IMPLEMENT MAKERS and have acquired more premises in Price St.
A G Parker,the founder ,was a keen rifleman with an inventive turn of mind. He invited his nephew A T C PARKER to join the firm, which continued to prosper,becoming a limited company in 1904.
MR HALE was responsible for the introduction of 'PARKERIFLING' which saw use as an inexpensive way of converting .303 calibre rifles to .22 rinfire for troop training during the first world war.The process of re ligning small calibre barrels was further developed to provide target rifle accuracy.
The founder of the firm died in 1915 and in 1925 MR ATC HALES second son,arthur,joined the firm.
By the 1920s A G PARKER& CO could furnish a range of fullbore 303 target rifles based on the LEE ENFIELD and a variety of aperture sights (rear).some of which were built under licence from BSA and others which were developed by the firm itself.The shotguns on offer were the BSA range,the WEBLEY AND SCOTT double and single and the singal barrel VICKERS VANGUARD.
In 1928 the firm was given a boost by the victory of A C HALE in the BISLEY MEETING. This followed a family record set up in 1926 when three members of the HALE family all reached the KINGS HUNDRED at BISLEY.
The role played by the HALE family in the fortunes of the firm was acknowledged in 1936 by a change of name to PARKER HALE LTD
It seems as if we have differing sources of information.
I will have to dig out the book by 'Ma Parker' to get the rest.