Troubleshooting The M1 Rifle: Bolt Release Timing

Troubleshooting The M1 Rifle: Bolt Release Timing

Give me a Garand, a pocket full of clips and a place to shoot it, and I'm a happy man. The M1 is easy to shoot, reliable and accurate. Unfortunately, these rifles are 60 to 70 years old, and many saw heavy use with foreign armies before they returned to our shores, so parts wear and breakage is common.

Parts are still relatively plentiful and (in most cases) inexpensive. If your rifle fails to function, your biggest challenge will be finding someone who can fix it. Your average gunsmith who may be great with Remington 870s and Ruger M77s is unlikely to have the knowledge, parts or tooling necessary to repair Garands.

Not a problem. You can probably repair it yourself. Military rifles are designed to be repaired in the field by unit armorers with minimal gunsmithing skills. Parts are interchangeable and disassembly is easy.

Bolt release timing is the position of the clip during the loading cycle at the moment of bolt release. As the loaded clip is inserted into the rifle, pushing the follower down, the follower rod actuates the operating rod catch, releasing the operating rod and allowing the bolt to move forward.


There are half a dozen parts all working together to make this happen. A part that is worn or damaged can delay bolt release, making the rifle difficult to load. The clip will have to be pushed downward into the rifle with more force than normal. We call this condition "late" bolt release.


Military armorers checked rifles for proper bolt release with a special gauge milled from a block of steel in the shape of a loaded clip. A groove was cut into the right side of the block, indicating the release point.


The gauge is inserted into the rifle and the bolt should release when the edge of the receiver is level with the groove. If the block bottoms out without releasing the bolt, the rifle is inspected for worn or defective parts.

Original military gauges are relatively rare, but reproductions are available from Brownells made from Delrin for $38.99. Although the gauge is the best way to determine bolt release timing, a clip of dummy rounds that is marked at the release point in a known good rifle can be used as a substitute.

Once we have determined a rifle suffers from improper timing, it is disassembled and the relevant parts are inspected as follows:


Bullet Guide: This stamped piece of metal is the primary cause of late bolt release. The critical wear area we are concerned with is the little hump in front of the follower arm pinhole known as the "accelerator bearing point". Measure the height of this point with a dial caliper. It should be .179" minimum to .183" maximum. Generally, higher is better.

A shiny spot is usually visible where the accelerator portion of the op rod catch rubs. New guides are available from parts vendors such as Fulton Armory, and it's a good spare part to have in your kit. Expect to pay about $20 for a new one.

The follower arm pin is another high wear part that should be checked. This pin passes through the receiver, op rod catch, follower arm and bullet guide, and is a critical bearing point. I have found that simply replacing this $3 pin will correct the timing on some rifles. The pin diameter should be .156" minimum. Keep a couple spares.


A bent operating rod could also be the culprit, but you can't check it with your dial caliper. A rare, sophisticated gauge is required to check op rods. However, you can borrow a rod from another rifle. If bolt release is corrected and you've narrowed the problem to the operating rod; it can be shipped to Columbus Machine Works for repair. I've sent rods to them on several occasions and their work is exemplary.

Check the follower arm for straightness with a 6-inch scale and check the pivot pin hole in it for size (maximum .162").

Worn parts should be replaced. Modifying parts to adjust bolt release timing will cause other problems. You will need a good bench reference handy when troubleshooting the Garand and I have found none better than The U.S. .30 Caliber Gas Operated Service Rifles: A Shop Manual by Jerry Kuhnhausen, available from Brownells. My copy has served me well since 1995.

Recommended for You

Rifles

Suppressor-Ready CZ 527 Review

David M. Fortier - July 22, 2019

CZ-USA's handy CZ 527 7.62x39mm bolt gun now accepts a sound suppressor.

2nd Amendment

Ontario, Canada Chief Firearms Officer Comments on AR-15 Buying Surge and Gun Licensing

TheGunBlog.ca - July 16, 2019

Ontario Chief Firearms Officer, Dwight Peer, spoke with TheGunBlog.ca about the Canada-wide...

Historical

World War II German Elefant Tank Destroyers

Neal S Shera - July 12, 2019

The last of Germany's infamous Elefant tank destroyers.

See More Recommendations

Popular Videos

Springfield Armory Saint Victor in .308

The Saint Victor in .308 features a 16" light weight barrel, M-LokĀ® free float hand guard and included flip-up sights.

Performance Center M&P Shield M2.0

From Smith & Wesson, the M&P Shield M2.0 is a great option for a carry gun with optics option.

New Bushnell Prime 1700 and Nitro 1800 Rangefinders

Jake Edson of Bushnell Optics tells OSG's Lynn Burkhead about the brand new Prime 1700 and Nitro 1800 rangefinders.

See more Popular Videos

Trending Stories

Air Guns

AirForce Airguns Condor Ring-Loc Kit Review

Tom Gaylord - May 29, 2019

Sponsored By
Airforce Airguns
2nd Amendment

2020 is Trump's to Blow with Gun Owners

David Codrea - July 09, 2019

No one can restore receptivity to another Trump term with these disaffected gun owners but the...

2nd Amendment

Is Red Dawn Really Just Ridiculous? If Not, Who Would Citizen Disarmament Help?

David Codrea - May 29, 2019

If you want to keep the peace, keep and bear arms. Don't give up your guns. Any other choice...

See More Stories

More How-To

How-To

Building a Crickett Rifle for Survival

David Fortier - August 26, 2016

Jaderborg replaced the Crickett's factory stock with a simple PVC tube with a wooden dowel...

How-To

Finding The Ideal 5.45x39mm SBR

Vincent Buckles - March 23, 2015

The 5.45x39mm Soviet cartridge was a relative stranger to the mainstream American firearms...

How-To

Shooting the MP-28 Submachine Gun

David Fortier - June 09, 2016

Without a doubt, it was a bit awkward and the side-mounted magazine didn't help its balance...

See More How-To

GET THE MAGAZINE Subscribe & Save

Temporary Price Reduction.

SUBSCRIBE NOW

Give a Gift   |   Subscriber Services

PREVIEW OUR CURRENT ISSUE

GET THE NEWSLETTER Join the List and Never Miss a Thing.

×