

$69.00 ~ Standard (M1 & M1 "Tanker", Beretta BM-59)
$85.00 ~ Demilled*
$105.00 ~ Extended Length (M1, Beretta BM-59)
$30.00 ~ Oversized, reduce to .5260" dia. (M1 & "Tanker", Beretta BM-59)
$110.00 ~ Italian Beretta*
* Demilled Piston Tip
There are surplus op-rods available in the market where the rods have been demilled by cutting through the piston. There will be an extra charge to fill the notches the cut leaves in the tube. Some of the cuts leave notches which are significantly longer, those tubes can also be repaired for an additional charge.
* Italian Beretta Piston Tip
It is more difficult to replace the piston tips on the Italian Beretta op-rod. These type of op-rods can easily be identified by the holes on the side of the tube.

(M1, M1 "Tanker", M1-Carbine & M14, Beretta BM-59)
$69.00 ~ Receiver guide lug rebuild**
** For guide lug rebuilds, there will be a minimal visibly affected area of Parkerizing. When your rifle is assembled, this is visible to the very rear of the rod where the handle meets the guide lug and is from final hand finishing of the machining. There will be other areas of the Parkerizing affected, but they are to the inside toward the receiver and the very bottom toward the guide lug slot.
We do not currently offer Parkerizing services.
(M1 & "Tanker" only)
(M1, M1 "Tanker", M1-Carbine & M14, Beretta BM-59)
$43.00 ~ Bolt cam slot tip repair
(M1 & M1 "Tanker")
$159.00 ~ 1st or 2nd oversize hone out-of-spec gas cylinder supplied, and install new piston tip on op-rod supplied, to match
$159.00 ~ Build "Tanker" M1 op-rod from supplied Standard M1 op-rod
(Op-rods supplied for conversion will need to be evaluated for other repairs.
Other recommended repairs will be in addition to this charge to convert a standard op-rod into a “Tanker”.)
For Beretta-Style Low Gas Cylinder
$55 ~ Literally straighten a standard M1 op-rod for use with Beretta-style low gas cylinder.
Includes tilt test to ensure function with the drop-style gas cylinders.
$15.00 per op rod ~
Over the years, we have been sent op-rods coated in cosmoline, heavy dried grease, and generally heavily soiled oil and grease when coming out of long term storage.
When it is necessary, we are happy to clean op-rods like this prior to repairs, but they will be subject to a cleaning charge.
* To avoid this fee, please make sure the rods are clean prior to shipping to us.
We are no longer accepting remanufactured op-rods. Please see information below to help identify whether your op-rod has been remanufactured. If a remanufactured op-rod is shipped to us, we will contact you to see if you want it returned to you. You will be required to provide a pre-paid return shipping label. Please examine your op-rod carefully.
Remanufactured op rods are op-rods which have had the original tube replaced with a new tube, then refinished, giving the appearance of a “new” rod. In most cases, these rods are not even close to being able to mount in an M1, so they require more time to properly contour. Pistons also appear to have been left oversized. As a result, completing these rods takes more work than a standard repair, which is why these op-rods incur additional cost for gauge check, straightening and tilt test. The price for sizing an oversized piston for a remanufactured op-rod is the same as for a non remanufactured op-rod.
The photos below provide examples to help identify remanufactured op-rods. The irregular coloring just forward of the original weld adjacent to the saddle is the weld attaching the new tube.
This example has been finished off smoothly in that area and reparkerized.
Custom Parts and Accessories

0815-BSLV

0815-SC

1908-SC

AR15-TE

50-TE

M1C-GCR

M1-FS

M1-GC

M1-GVT

M1-ORP

M1-RSP

M1-SAB

M1-TE

M1-TBD

M1-TBS

M14-FSA

M14-TE

M1A-SMB

MG34-CH

MG34-SC

MG42-SC

30-MZ

03A3-TE
This Agreement is entered into by and between Columbus Machine Works, Inc., an Ohio corporation (hereinafter “Columbus Machine”) and the party named on the Estimate/Invoice (hereinafter “Buyer”) as of the date shown on the Estimate/Invoice.
WHEREAS, Columbus Machine is a parts manufacturer and Buyer wishes to have Columbus Machine manufacture parts and/or products for Buyer’s benefit; and
NOW THEREFORE, in consideration of the mutual covenants contained herein and subject to the terms and conditions of this Agreement, and the parties hereto agree as follows:
Section 1. Buyer agrees to purchase from Columbus Machine the parts and/or products for a certain price both of which are specified on the Quote attached to this Agreement. The terms of the Quote are in addition to the terms of this Agreement. Together, the Quote and this Agreement represent the entire agreement between Columbus Machine and Buyer.
Section 2. Columbus Machine will either manufacture a part or product based on (i) Buyer’s specifications, (ii) a sample provided by Buyer, (iii) drawings drafted by Columbus Machine, or (iv) any combination thereof. Columbus Machine states and Buyer acknowledges that Columbus Machine does not provide any engineering or metallurgical services. Buyer agrees that it is solely responsible for obtaining all engineering and metallurgical studies and/or reports. Buyer further agrees to indemnify and hold harmless Columbus Machine, its agents, representatives, employees, officers, related companies, affiliates, successors, and assigns from any and all claims, demands, actions, damages, and liability, including attorney’s fees and consequential and incidental damages, arising our of any injury or death to any person or damage to any property in any way connected with the parts and/or products manufactured by Columbus Machine. Buyer hereby agrees that it shall be solely responsible for and shall indemnify Columbus Machine from any voluntary or involuntary recalls of any products which contain parts or products manufactured by Columbus Machine or are parts or products manufactured by Columbus Machine regardless of the reason of the recall.
Section 3. EXCEPT AS SPECIFICALLY STATED HEREIN, THERE ARE NO WARRANTIES, EXPRESS OR IMPLIED, WITH RESPECT TO ANY PARTS OR PRODUCTS MANUFACTURED BY COLUMBUS MACHINE. COLUMBUS MACHINE EXPRESSLY EXCLUDES AND DISCLAIMS ANY IMPLIED WARRANTY OF MERCHANTABILITY AND ANY WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE, APPLICATION OR USE, AND BUYER AGREES THAT THE GOODS ARE SOLD "AS IS." UNDER NO CIRCUMSTANCES WILL COLUMBUS MACHINE BE LIABLE FOR SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES, WHETHER SUCH DAMAGES ARE SOUGHT IN CONTRACT, IN TORT (INCLUDING BUT NOT LIMITED TO NEGLIGENCE AND STRICT LIABILITY) OR OTHERWISE, AND SELLER’S LIABILITY SHALL IN NO EVENT EXCEED THE PURCHASE PRICE OF THE PARTS OR PRODUCTS ON WHICH SUCH LIABILITY IS BASED. BUYER ASSUMES ALL RISK AND LIABILITY FOR LOSS, DAMAGE OR INJURY TO PERSONS OR PROPERTY OF BUYER OR OTHERS ARISING OUT OF USE OR POSSESSION OF ANY PART OR PRODUCT SOLD HEREUNDER.
Columbus Machine has no knowledge as to trademark or patent rights which third parties may claim in the goods that covered by this Agreement. Consequently, Columbus Machine makes no warranty whatsoever with respect to the freedom of the goods covered by this Agreement from claims of infringement by third parties arising from trademark, patent, or other property rights in the goods. Buyer understands and agrees that Columbus Machine does not warrant the goods free of the rightful claim of any third person by way of infringement or the like. Buyer further agrees to indemnify and defend Columbus Machine, at Buyer’s sole expense, against any claim of trademark or patent infringement arising out of any part or product sold under this Agreement and to hold Columbus Machine harmless from any damages, costs, attorney’s fees and expenses attributable to any such claim.
The use of any sample, model, or drawing during the negotiations leading to this Agreement serves merely to indicate the type of goods that will be tendered to the Buyer. The samples or models create no warranty that the parts or products will conform to the samples, models, or drawings.
Section 4. Buyer's exclusive remedy and Columbus Machine's limit of liability for any and all losses or damages resulting from defective goods or from any other cause shall be for the purchase price actually paid for the particular delivery with respect to which losses or damages are claimed. Columbus Machine shall not be liable for prospective profits or special, indirect or consequential damages, nor shall any recovery of any kind against Columbus Machine be greater in amount than the purchase price of the specific material sold and causing the alleged loss, damage or injury.
Section 5. Buyer agrees to pay all invoices within thirty (30) days of receipt and to pay a monthly finance charge of 1.5% (with a minimum charge of $3.00) on invoices not paid within thirty (30) days. In the event that legal action is required to collect money due for goods and services, Purchaser shall pay all reasonable collection agency costs, attorney’s fees and court costs incurred by the Seller.
Section 6. This Agreement shall be governed by and shall be construed in accordance with the laws of the State of Ohio. In connection with any dispute between the parties under this Agreement, the parties hereby irrevocably submit to jurisdiction of the Common Pleas Court and the Municipal Court of Franklin County, Ohio. Each party hereby waives and agrees not to assert, by way of motion, as a defense or otherwise in any such action any claim (a) that it is not subject to the jurisdiction of such court, (b) that the action is brought in an inconvenient forum, (c) that it is immune from any legal process with respect to itself or its property, (d) that the venue of the suit, action or other proceeding is improper, or (e) that this Agreement or the subject matter hereof may not be enforced in or by such courts. The obligations of the parties are performable and venue for any legal action arising out of this Agreement will lie in Franklin County, Ohio.
Section 7. It is expressly understood and agreed by and between the parties hereto that this Agreement sets forth all the promises, representations, agreements, conditions and understandings relative to the transactions set forth herein, and that there are no promises, representations, agreements, conditions, or understandings, either oral or written, between them which have not been expressed herein. It is further understood and agreed that no subsequent alteration, amendment, change or addition to this Agreement shall be binding unless reduced in writing and signed by all parties.