Addressing Feed Problems
Magazine Issues
One of the most frequent CMMG .22 conversion issues revolves around feeding. When the ammunition fails to reliably enter the chamber, it’s a frustrating experience. The underlying cause is often multi-faceted, but understanding the key culprits is vital for diagnosis.
Magazine issues are a primary suspect. The magazines, designed to hold and feed .22 LR rounds, can suffer from damage or wear. Examine the feed lips – the critical components that guide the round into the chamber. Over time, these lips can be bent, damaged, or deformed, preventing the rounds from aligning correctly. Also, consider the magazine spring. A weak or damaged spring might not provide sufficient force to push rounds upwards, leading to failures. Cleaning and lubricating the magazine internals is important. Ensure that there are no obstructions or debris. It is recommended to replace magazines if feed lips are bent or damaged, or springs are weak.
Bolt Cycle Issues
The bolt itself needs attention. If the bolt doesn’t cycle far enough to reliably pick up the next round from the magazine, feeding issues will occur. This problem can be caused by several factors. The first to examine is the cleanliness of the bolt and the conversion kit itself. Carbon buildup, debris, and insufficient lubrication can impede the bolt’s smooth movement. Clean and re-lubricate the entire system, paying close attention to the bolt rails and the chamber.
Ammunition Considerations
The design of the .22 LR ammunition itself can also contribute. The .22 LR round typically has a round nose profile. Depending on the specific ammunition and magazine design, this profile can sometimes catch or hang up on the feed ramp or the edge of the chamber. Experimenting with different brands and types of .22 LR ammunition can often yield better results. Some ammunition brands have a more pointed profile which may feed more smoothly in certain rifles.
Buffer and Spring Considerations
Finally, consider the buffer weight and spring. The buffer and spring are critical components of the AR-15’s cycling system. The weight and spring tension must be properly balanced for reliable operation. An overly heavy buffer or a stiff spring can impede the bolt’s rearward travel, which can also cause feeding issues. The correct buffer weight is usually a standard AR-15 buffer. However, a stiffer spring might be needed to ensure more reliable cycling. Always make sure the buffer is freely moving in the buffer tube, and replace if worn.
Ejection Troubles: Clearing Spent Casings
Extractor Inspection
Failure to eject (FTE) is another frequently encountered CMMG .22 conversion issue. This occurs when the spent cartridge case doesn’t get extracted from the chamber and ejected from the rifle. This leads to jams. Several factors contribute to FTE, including the extractor, the extraction port, rim damage, and insufficient bolt cycling.
The extractor is a small but crucial component of the bolt, responsible for gripping the rim of the spent cartridge and pulling it from the chamber. Extractor issues often manifest as failures to eject. Check for a worn, damaged, or weak extractor. The extractor should move freely, spring should be strong, and it must have a good grip on the cartridge rim. Inspect for wear and tear, and if the extractor appears worn, it should be replaced. A weak extractor spring can also fail to provide the necessary grip. A stronger replacement spring might be needed.
Extraction Port Inspection
The extraction port, the opening in the upper receiver through which the spent cartridge is ejected, also deserves attention. Debris, carbon buildup, or obstructions in this area can interfere with the ejection process. Clean the extraction port thoroughly, removing any obstructions or residue.
Cartridge Rim Damage
Check the spent cartridge casings. Examine the rims for damage. If the extractor struggles to grip a damaged or deformed rim, it may fail to eject the casing. If damage is evident, the ammunition could be contributing to the problem.
Bolt Cycle Considerations
As with feed issues, ensure the bolt cycles far enough to eject the spent casing. The buffer weight and spring again play a role here. Issues with the buffer assembly can affect the bolt cycle, leading to FTE.
Primer Strikes: The Spark That Doesn’t Ignite
Firing Pin Issues
Light primer strikes (LPS) are a serious problem that directly impacts the ability to fire the rifle. When the firing pin doesn’t strike the cartridge primer with enough force, ignition fails.
The firing pin itself is a key point of inspection. Look for any signs of wear, bending, or damage. A worn or damaged firing pin may not deliver sufficient impact to ignite the primer. Also, make sure the firing pin moves freely within its channel. Clean and lubricate the firing pin channel to ensure smooth and reliable firing pin travel. Remove any obstructions that may be interfering with the firing pin’s movement.
Bolt Closing Issues
Ensure the bolt fully closes. The bolt must be fully closed and locked in battery to deliver a consistent and reliable primer strike. This may be caused by a dirty chamber.
Accuracy Matters: Hitting the Target
Barrel and Chamber Considerations
Accuracy issues, though often less critical than reliability issues, can still detract from the shooting experience. Several factors influence the accuracy of a CMMG .22 conversion kit.
The barrel and chamber relationship with the conversion kit is important. Make sure the barrel is properly aligned with the bolt face. Examine the barrel for any signs of damage or obstruction. Cleaning and lubricating the barrel can help improve accuracy. Experimenting with different ammunition brands is crucial. Different brands of .22 LR ammunition will perform differently in each rifle.
Optic Considerations
If you are using a scope, make sure the optic is properly mounted and zeroed. Loose or improperly mounted scopes can significantly affect accuracy. Following these guidelines can significantly improve the shooting experience with your CMMG .22 conversion kit.
Dealing with Magazines: The Fuel of the Firearm
Magazine Inspections
Magazine-related problems are common CMMG .22 conversion issues that must be considered.
Magazines can be damaged during use. Make sure the magazine lips are undamaged. If any problems are noted, replace the magazine. Magazines should be cleaned and maintained just like any part of your firearm. Lubricate to ensure smooth operation.
Maintenance: The Key to Reliability
Proper maintenance is the cornerstone of a reliable CMMG .22 conversion kit. Regular cleaning and lubrication are essential.
Clean the kit after each shooting session or when noticeable fouling is present. Disassemble the bolt, clean all parts thoroughly, and remove any carbon buildup or debris. Lubricate all moving parts with a quality gun lubricant. Pay close attention to the bolt rails and the chamber, ensuring they are free of obstructions.
Cleaning frequency depends on the number of rounds fired and the ammunition used. Using high-quality ammunition will help minimize fouling.
Upgrades and Modifications: Enhancing Performance
While a properly maintained conversion kit should function well, some users may want to consider upgrades and modifications to enhance reliability and accuracy. Aftermarket bolt upgrades, stronger extractors, and firing pin upgrades are available.
Common Mistakes: Avoiding the Pitfalls
Several common mistakes can undermine the performance of a CMMG .22 conversion kit.
*Improper installation or maintenance*: Always follow the manufacturer’s instructions during installation.
*Using the wrong ammunition*: Stick to high-quality .22 LR ammunition to minimize fouling and enhance reliability.
*Ignoring signs of wear and tear*: Inspect the components regularly and replace worn parts promptly.
Conclusion: Mastering the .22 Conversion
The CMMG .22 conversion kit offers an excellent opportunity to enjoy the AR-15 platform with cost-effective .22 LR ammunition. While CMMG .22 conversion issues are possible, they can be resolved by understanding the potential problems and following the proper maintenance procedures. Regular cleaning, lubrication, and a keen eye for potential issues will ensure reliable performance and maximize your shooting pleasure.
