Thanks for the reply Troy,
Here are the build instructions that should have been included with the lower:
if it is an older one that uses standard take down pins:
Thank you for purchasing a CAV-15 receiver kit! Below is a list of things to check before you assemble your CAV-15.
• Check all pinholes before you Assemble gun! Parts very slightly between manufactures and some parts may fit tighter than others, especially the safety selector detent.
• Rear takedown pin and safety selector detent pins/springs load from the top. These springs may need to be trimmed for proper fit. About ¼ of an inch will need to be taken off the rear take down pin spring.
• Bolt hold open spring will need to be trimmed 1 to 1½ coils for the last round hold-open to function with older/weak magazines.
• The 5/64th roll pin attached to this sheet is to capture your buffer detent pin and spring.
Your receiver carries a lifetime replacement warrantee, if your receiver breaks from normal use; we will replace it for free. If you break your receiver due to abuse or negligent use, there will be a nominal fee ($30.00 plus shipping).
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If it is one that uses speed pins:
Thank you for purchasing a CAV-15 receiver kit! Below is a list of things to check before you assemble your CAV-15.
• Takedown Pins: Use the supplied speed pins to secure your upper receiver to your CAV-15 lower receiver. If you lose or misplace the supplied pins, replacement pins can be ordered for $5.00 a piece from Cavalry Arms.
• Check all pinholes before you Assemble gun! Parts very slightly between manufactures and some parts may fit tighter than others, especially the safety selector detent.
• Safety selector detent pin/spring load from the top. The spring may need to be trimmed for proper fit.
• Bolt hold open spring will need to be trimmed 1 to 1½ coils for the last round hold-open to function with older/weak magazines.
• The 5/64th roll pin attached to this sheet is to capture your buffer detent pin and spring.
Your receiver carries a lifetime replacement warrantee, if your receiver breaks from normal use; we will replace it for free. If you break your receiver due to abuse or negligent use, there will be a nominal fee ($30.00 plus shipping).
View Quote
Call us at 480-833-9685 M-F 10AM-6PM AZ time if you have more questions.
Also be sure to check out our indsutry forum here on AR15.com: [url]http://www.ar15.com/forums/forum.html?b=2&f=61[/url]