Steve and Caleb from Brownells delve into a series of common errors that people often make while assembling or modifying their AR-15 rifles. This video builds upon previous discussions, bringing new insights into both upper and lower receiver assembly nuances. Here are the key takeaways:
Mounting Accessories that Contact the Gas Block: A crucial mistake highlighted is attaching accessories like bipods directly to the handguard in such a way that screws exert undue pressure on the gas block. This misalignment can lead to accuracy issues by subtly altering the barrel’s position. The solution involves carefully selecting the attachment point or opting for shorter screws to prevent interference with the gas block.
Gas Block Alignment Missteps: Incorrect alignment of the gas block is another widespread issue. Properly aligning the gas block with the barrel’s gas port is essential for the rifle’s reliable operation. Misalignment can lead to cycling problems due to insufficient gas flow, highlighting the importance of precision in this aspect of assembly.
Over-Torquing the Castle Nut: Applying excessive torque to the castle nut can damage the threads of the receiver extension, also known as the buffer tube. The recommended torque setting is 40 foot-pounds. Exceeding this value can compromise the structural integrity of these components, underlining the need to adhere to specified torque values for optimal assembly outcomes.
Excessive Material Removal in Upper Receiver Lapping: Overlapping, or removing too much material when lapping the upper receiver, can cause the barrel to sit too far into the upper receiver. This misplacement can affect feed ramp alignment and gas block positioning, potentially leading to functional issues. Controlled lapping ensures a proper fit without affecting the receiver’s structural alignment.
Improper Buffer Tube Installation: Failing to install the buffer retainer and spring correctly, or screwing the buffer tube in excessively, can obstruct the upper receiver’s closure. Correct installation depth is crucial for these components to perform their intended functions, retaining the buffer while allowing seamless closure of the upper receiver.
The video emphasizes the importance of learning from mistakes and sharing knowledge within the AR-building community. Steve and Caleb encourage viewers to share their own experiences and tips, fostering a supportive environment for enthusiasts and builders. This collaborative approach aims to enhance the building process for both novices and seasoned builders, ensuring the creation of reliable and accurately functioning firearms.
Note to readers: Please click the share buttons above or below. Forward this article to your email lists. Crosspost on your blog site, social media, internet forums. etc.
Check out the first video here-
Just checked and I just did that #1 😂
Great lessons
Good video. One issue with torquing the castle nut to the receiver is not using some reaction-type block to align the lower receiver with the key running along the bottom of the receiver extension. If you use an alignment tool, it will keep the receiver extension aligned properly at 6 o'clock and avoid the end plate tooth from damaging the receiver extension threads. Brownells has a tool and there are a number of other ones available if a web search is done. Note that the older Geiselle reaction block does not align properly since it only holds the receiver extension. You need one that holds BOTH the receiver extension and the cutout where the grip screw is inserted to properly align them both.
Never heard of lapping the receiver…😮
Also some folks skip the buffer detent… Intentionally. 😂
When lapping receiver, should you have a complete shiny surface?
hey brownells, please return arf to a useable site before the 8-12-25 "upgrade". its beyond trash now and users have spoken, we all hate it
Stop saying "issue". Issues are magazines and newspapers, not problems
Is there a spec on exactly how far the buffer tube should be screwed into the lower receiver?
My mistake never use red lock tight on any screws you might some time need to take apart
Disconnector and bolt catch springs. Mixing them up is one. Putting the disconnector spring in upside down is another. Double-check that the large end of the spring is installed in the trigger, and the tapered end is seated underneath the notch in the disconnector.
Having an issue capturing safety lever on Anderson A10 build. Large detent, spring, grip and screw in place. What am I missing?
Nice info
Quad rails for the win
Please papa, no spank Caleb.
I have a pointer 😊😊
Wow Dremel on a gas block if you are doing this you need to let someone else build it because you are not competent
"I know you're thinking big deal whatever." No I don't think that way. A lot of little details are a Big Deal.
ive never put more than 10 ftl bs on my castlenut…even my FRT trigger AR hasnt loosened it in 2500rds. No staking either
How do you clean the gas block and tube or do you have to clean them?
@2:50 whoa whoa whoa, DON’T BRING LOGIC INTO THIS!!! 😂
Mistake 1 should be buying components from Optics Planet. You'll wait 3 months and they still won't be there
Can u lap the buffer tube with the receiver lap?
I want their job
Honestly I can't believe you didn't make sure to clear your gas block like that when mounting anything. With mounting the gas block I use my bore scope to visually verify my gas block alignment hole to the barrel. The surest way to know you are properly aligned every time.
Show me the birth certificates to prove you aren't related.
To align gas block, use a Gas Block Dimpling Jig.
I prefer to learn from other peoples mistakes…