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All barrelling is done on an English Colchester lathe. The lathe was refurbished back to factory specification five years ago and is serviced twice a year, both mechanically, and electrically and is maintained on a regular schedule.

Reamers.

I only use quality reamers from PTG, Border Ballistics and Dave Manson reamers, and only the live pilot versions. This entails a tight fitting pilot fitted exactly, to the barrel bore, for the reamer to revolve in. This ensures no scoring, perfect alignment, and through flush of cutting oils, provided by the lathe's on board coolant system. All barrels are reamed with a constant supply of cutting oil being pumped through the muzzle end of the barrel, and over the reamer, as it cuts. This ensures no chips can go over the reamer as it cuts, and leaves a perfect, scratch free chamber. The pilots, in conjunction with the floating reamer holder, also ensure the chamber is perfectly concentric to the bore.

The barrel muzzle is dialled in to zero, at the same time as the chamber throat. The lands and grooves at the throat, are dialled in with an Interapid 0.0005” long reach indicator. The throat is dialled in to zero, and the chamber is pre bored long enough, to allow the reamer Pilot to fully engage the bore, BEFORE any cutting takes place. At NO time is the reamer allowed to “follow the bore” unguided. This ensures a perfectly concentric chamber to the bore. All barrels are chambered by myself. I DO NOT fit pre-chambered barrels, nor do I re-chamber existing chambers....neither are satisfactory in a custom rifle.

Muzzle threads.

I cut muzzle threads in UNF, UNEF, and metric thread forms.

All threads are cut concentric to the bore, after indicating bore in to "0".

All threads are cut to specification, and then measured with a certified thread ring gauge, in ALL thread forms.

Ring gauges are expensive items, but are the only way to guarantee that a muzzle thread is EXACTLY to specification. I cut all muzzle threads this way, and do not cut threads to fit a particular silencer or brake that does not have a "to spec " thread.

Thread caps can be made and fitted at the same time, from a very basic knurled one , to an invisible one, which looks like part of the barrel.
These are measuring devices for headspace on the range of barrels I make specifically for the Accuracy International range of Rifles. Certified Ring gauges for ensuring your muzzle thread , is EXACTLY to spec. This ensures all moderators and brakes, that are to spec, will fit. bedding.





Ring gauges

Invisible thread cap.

The tenon and thread it covers.