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Copy of GUNSMITHING SERVICES: Tier 1, Tier 2 Winchester M70 Receiver Accurizing

  • $ 27500
  • Save $ 25


Accurizing, often referred to as truing or blueprinting, is the process of improving the accuracy potential of a factory bolt action. LRI has pioneered the use of Vertical Machining Centers to accurize bolt action receivers. From a very humble beginning, we've refined the process with the use of with our Sunnen Precision honing station and with 5-axis cnc machining capability.

This is not art. It's deployment of modern manufacturing resource.

Challenges solved with our process:

Honing:

  • Single stroke diamond honed to deliver a straight/round ID bore
  • Honing delivers a superior internal bore surface finish
  • Honing sizes the bore for proper clearance/function
  • Honing creates a qualified reference feature for later machining ops

5 Axis cnc receiver accurizing:

  • Reduction in tool library eliminates tolerance stacking
  • Consolidated machining operations improves dimensioning accuracy
  • Exceptional Parallelism between bolt and receiver lug surfaces
  • Use of a "Higbee" lead thread to eliminate the risk of a torn or galled thread start
  • Distortion free work holding ensures accurate machining
  • Taper free receiver ring threads with use of thread milling tool paths
  • Standardization of threads via qualified gauging
  • Misaligned optic base holes eliminated 
  • Superior surface finish from solid workholding and aerospace quality machining and tooling
  • Receiver bottom is machined flat to ensure distortion free surfaces for setup work.

 

The end result are features and a level of precision that were once the exclusive domain of custom actions.

 

 

 

 Tier 1 Accurizing Standardized Features:

  • Single Stroke Diamond Honed ID receiver bore
  • Higbee Lead thread feature 
  • Helically milled thread ring 1.0625-18tpi
  • Thread milled receiver ring threads, 8-40tpi
  • reconditioned lug abutments
  • Bolt face resurfacing
  • Bolt Lugs resurfaced
  • Primary extraction feature tuned
  • 2* draft taper to lead side of recoil lug for easier removal from stock once bedded

 Tier 2 Accurizing Standardized Features:

  (Retains OEM threads, use for Savage type barrel nuts for "Remage"            setups)

  • Single Stroke Diamond Honed ID receiver bore
  • reconditioned lug abutments
  • Bolt face resurfacing
  • Bolt Lugs resurfaced
  • Primary extraction feature tuned
  • TIG welded/silver soldered bolt handle

Optional Features and Services:

  • Striker pin Bushing installation
  • Turn Striker Pin to .0625"
  • Clip Slotting receiver for M40 style lugged optic base
  • Wide variety of bolt fluting options (CRF actions excluded)
  • Jeweled bolt body
  • 8-40 optic base hole enlargement
  • Extended internal magazine modification
  • Tactical bolt knob installation
  • Single and multi colored Cerakote application
  • Parkerize coating application (limited to carbon steel actions only)
  • Glass bead blast finish (limited to stainless actions only)
  • Installation of aftermarket bolt handle 

Proven Performance:

In the spring of 2013 LRI announced a very ambitious project to one of the toughest and most demanding precision rifle audiences in today's shooting community:  SnipersHide.com  

We began offering accurized M700 barreled actions through an internet special.  Since that time LRI's "Sniper's Hide M700 Accurized Barreled Action Group Buy" has grown into the largest and most continuous internet special in the history of the Sniper's Hide website.  That core experience is now applied to the Winchester M70 actions.

LRI has literally produced thousands of custom built barreled actions for precision shooting enthusiasts. Our services have gone international with clients working in Private Security, Risk Management, and Law Enforcement.  The success of our effort validates the process and has ushered a new chapter in how precision bolt action barreled actions are assembled.  Additionally, we have over 115 domestic/international dealers that retain our services for machine work.

You are in good hands.

  

 

IMPORTANT:

Finish Limitations with bolts and receivers.

M70's are unique in that they are a casting.  This presents a unique challenge because clamping the action in the required manner causes the receiver to distort due to the irregular exterior.  Part of our process is to "deck" the bottom of the action so that it is flat.  Because of this, any finish on the bottom of the receiver is machined away.  This makes carbon steel actions more vulnerable to corrosion.

A fundamental of any machining operation is rigid and solid work holding, (clamping the part to the machine in a manner that prevents it from unintended movement)  

LRI treats your property with great respect, however there are limitations.  We cannot guarantee that our fixtures will not damage the surface finish of your receiver.  We are as careful as we can be, but collets and vices are made from tool grade, heat treated steels.  They are hard and very tough to ensure a repeatable register for thousands of cycles.  

Because of this your receiver may require refinishing.  This cannot be avoided. LRI offers a full menu of finishing options that will restore your receiver to pristine condition.

Reciever ring threads:

The threads on the M70's in the controlled round feed and push feed configurations is 1-16.  One inch diameter, 16 threads per inch.   The historical process of "cleaning" up existing threads on M70's as part of bluprinting takes a radical turn here at LRI. 

The major diameter of the existing one inch thread becomes the minor diameter when we enlarge them to 1.0625"-18.   We do this because the M70 threaded barrel cylinder is quite short.  What we are after is increased surface area to better support the barrel in the receiver.  There's no consequence because the receiver ring diameter is 1.350". -The same as the vast majority of other action designs.  The other advantage here is we are effectively waving a magic wand over the action by working with virgin material.  This is powerful as it allows us to make very highly controlled threads with important peripheral features.  In the same setup we also project the receiver ring face .05" and draft angle the forward facing surface of the recoil lug.

 

 

 

 

 

 

 

 

 


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