EC Enterprises

Barrel Threading Customer Project Sheet

Complete this after selecting the intended profile from the EC technical guide. EC will verify the actual barrel and device before accepting a machining specification.

Planning reference—not a machining specification. Current instructions and drawings for the actual barrel, firearm, muzzle device, mount, piston, or adapter always supersede this EC document. Confirm thread class, finished major and pitch diameters, root form, relief, length, shoulder geometry, torque, and alignment requirements before work.

Customer name

Phone / email

Firearm make / model

Caliber / cartridge

Barrel identification / serial if applicable

Barrel format □ loose □ barreled action □ complete

Requested work and intended result

Requested thread callout

Thread length from device drawing

Device / mount / piston manufacturer and model

Manufacturer document / revision

Requested undercut □ none □ .005 below calculated root □ maker specified

Requested shoulder / indexing method

Barrel OD measured at finished location

Known groove diameter

Calculated radial shoulder

Calculated radial wall

Existing damage, prior work, taper, sights, pins, welds, flutes, or handling concerns

Items supplied with barrel and return instructions

Customer signature

Date

Requested values describe the project; they are not machining authorization. EC may revise or decline the requested geometry after inspection and will obtain approval for a changed scope.