We have the fastest turnaround on custom rifle barrels, typically 10-14 business days from time of order! (does not include those barrels that are chambered/threaded or crowned) Our barrels are produced under strict quality control throughout their manufacturing. Every barrel is manufactured as if it were for ourselves. We are not a mass production shop, we are a quality production shop. Rifle barrels start out with a perfectly straight piece of either 4140 or 416R Rifle barrel quality steel. A precision hole is drilled through the blank that is just under the finished bore size. It is inspected prior to continuing in the process. Once it has been drilled, the barrel will go through reaming, reaming it to the finished bore size. After this the barrel is inspected to ensure a good ream, if it does not pass inspection the barrel is reamed up to the next caliber. Once the reaming is done, the barrel goes through a process of honing the barrel. This removes the vast majority of any reaming (tooling) marks left in the barrel. The barrel is then again inspected. After the barrel has been honed & passes inspection, it then goes through our rifling process. We use precision button rifling. Button rifling is probably the most widely used method to form the rifling in barrels today. It is accomplished by either pulling or pushing a precision carbide tool, called a button, through the barrel. This process of rifling extrudes or presses the rifling into the barrel. The button rifling process work hardens the rifling which will lead to longer barrel life. After rifling the barrel is then again checked for quality. At this point if the barrel does not pass inspection it is scrapped and the process starts all over again. Once the barrel has been rifled and passes inspection it is then placed in our high-tech heat treatment furnace for stress relieving. After the barrel has been heated to the proper temperature and held for a certain amount of time it is allowed to cool naturally. The process of stress relieving actually allows the steel to relax, relieving any residual stress caused by all of the above processes. Once the barrel has cooled after the stress relieving process the barrel is cleaned and then inspected. After inspection each and every barrel goes through hand lapping to ensure that the barrel is consistent from one end to the other. It also serves as a polishing of sorts for the inside of the barrel to ensure that the barrel is easy to break in. Procedures for breaking in barrels can be obtained by clicking HERE Below in the "Cartridges We Chamber" are a list of the cartridges that we chamber for. If you click on the cartridge you will see a chamber print for that cartridge. We will only show chamber drawings for cartridges that we currently carry chambering reamers for. This information is provided for reference use only. McGowen Precision Barrels cannot be held responsible for the accuracy of the numbers shown in these drawings. All Barrels Are Shipped In The White (unblued) To calculate the recommended twist for your cartridge, we recommend visiting Real Guns and registering for free. They have a variety of ballistic calculators for your use.
Chambering
Reamers marked with an (*) denote reamers that use a common chambering
reamer and then a Neck & Throat Reamer.
Other calibers & twists available via special order. Special order tooling takes approximately 9 weeks. All special order tooling require pre-payment. There is no refund for special tooling once manufacturing of the tooling has begun. Tooling costs will be quoted at the time of sale. For common calibers/twists we "may" split the cost of the tooling with the customer, but at the end of the job we will retain the tooling. For information on the Cooper Express cartridges listed in our "Cartridges We Chamber For" below please contact Neal Cooper at ncooper@gci.net It is impossible for us to carry every conceivable chambering reamer available out there today so in order to provide you with the very best customer service available we will at your request rent a reamer from 4D Products. So if you don't see the cartridge you are interested in our "What We Chamber For" column below please consult one of the links below to see if 4D carries it. If they do we can rent the reamer for you at a cost of $45.00 (added to your invoice) or you can order it from them and have it sent directly to us. 4D's reamers are very well maintained so you can be assured of a quality chamber. 4D Products Chamber Reamers Available Weatherby & Lazzaroni Cartridges
Customer Service: (406) 755-4907 McGowen Precision Barrels, LLC 740 West Railroad Street, Suite B, Kalispell, MT 59901
©Copyright 2007 McGowen Precision Barrels, LLC Custom gunsmithing, custom rifle barrels, savage barrels, savage pre-fit, accurate reloading, harry mcgowen, mcgowan barrels, gunsmithing, rifle, customrifle, kalispell, montana, rebarrel, chamber, cnc, jon frost, custom action, rifle action, cooper arms, firearms |
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