Frustratingly, a common problem AR-15 owners encounter is their stock not fitting the buffer tube. This seemingly simple issue can stem from several causes, ranging from minor misalignments to more significant compatibility problems. This guide will walk you through troubleshooting this issue, identifying potential problems, and offering solutions to get your AR-15 back in working order.
Identifying the Problem: Why Your AR-15 Stock Won't Fit
Before jumping into solutions, let's pinpoint the root cause. The problem usually boils down to one of these key areas:
1. Incorrect Buffer Tube Size or Type:
- Commercial vs. Mil-Spec: AR-15 buffer tubes come in two main specifications: commercial and mil-spec. These differ slightly in diameter, and a stock designed for one will not fit the other. A mil-spec stock will be too loose on a commercial tube and vice-versa. A commercial stock may appear to fit initially but will likely wobble and be unreliable.
- Buffer Tube Length: While less common, ensuring you have the correct buffer tube length for your stock is crucial. Certain stocks are designed for specific lengths. A mismatch here will prevent proper installation.
2. Stock Issues:
- Manufacturing Defects: While less frequent, faulty stocks can be manufactured with slight imperfections that prevent proper fitting. Examine the stock carefully for any warping, burrs, or inconsistencies.
- Damaged Stock: Previous damage, such as drops or impacts, can warp or deform the stock, hindering its proper alignment with the buffer tube.
3. Buffer Tube Issues:
- Damaged Buffer Tube: Similar to the stock, the buffer tube itself can be damaged, preventing a secure fit. Look for dents, scratches, or other signs of damage that might obstruct the stock.
- Loose Buffer Tube: In rare instances, the buffer tube itself might be loose within the receiver extension. This needs to be addressed before attempting to fit the stock.
4. Installation Errors:
- Improper Alignment: The stock needs to be aligned correctly before tightening. A slight misalignment can prevent it from seating properly.
- Over-tightening: Forcefully tightening the stock can damage it or the buffer tube. Always tighten gradually and evenly.
Solutions and Troubleshooting Steps:
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Verify Compatibility: Double-check that your stock and buffer tube are compatible. Confirm whether they are both mil-spec or commercial. Check the manufacturer's specifications for both components.
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Inspect for Damage: Carefully examine both the stock and the buffer tube for any signs of damage. Look for bends, cracks, scratches, or any inconsistencies.
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Check Alignment: Ensure the stock is perfectly aligned with the buffer tube before tightening. Apply gentle pressure while tightening the castle nut.
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Lubrication: A small amount of lubricant on the buffer tube can assist with installation.
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Tightening Technique: Tighten the castle nut gradually and evenly. Avoid over-tightening. Use the appropriate wrench to prevent stripping.
When to Seek Professional Help:
If you've tried the above steps and your AR-15 stock still doesn't fit, it's time to seek professional help from a qualified gunsmith. They have the expertise and tools to diagnose more complex problems and potentially repair damaged components.
Maintaining Your AR-15: Preventative Measures
Regular cleaning and maintenance of your AR-15 can significantly reduce the chances of encountering such issues. Inspecting your components regularly will help you catch potential problems early, avoiding costly repairs or replacements.
By carefully following these steps, you should be able to resolve the issue of your AR-15 stock not fitting the buffer tube. Remember, safety and proper assembly are paramount when working with firearms. If you are unsure about any step, consult a qualified professional.
