About Phase 5 Builders Bin

Due to an Overwhelming number of requests from small companies and serious AR15 builders, Phase 5 Weapon Systems Inc.® is Proud to introduce our newest Web Division!

The Phase 5 Builders’ Bin™

In this popular Phase 5 Web Division you will have access to our personal inventory and stash of OEM parts, OEM repair parts and hard to find small spare components that you can never have enough of. This Division will constantly rotate new relevant components in and out of the Builders’ Bin based on ability to offer the parts when we have a sufficient amount of the (part/parts) machined and in the parts bin. We hope that you will find these parts and their availability extremely helpful!
$65.00
+
$75.00
+
$99.00 $87.00
+
$8.00
+
CMC Drop-In trigger Group, 3.5lb Flat - Single Stage
Trigger, AR Single Stage FLAT
$174.00
+
CMC Drop-In trigger Group, 3.5lb Curved - Single Stage
Trigger, AR Single Stage CURVED
$174.00
+
Low Profile Gas Block (Clamp Screw)
Gas Block - Lo Pro Clamp
$29.99
Out-of-stock
$145.00
Out-of-stock
AR-15 Builders Lower Parts Kit
Builders Bin LPK
$49.99
+
$5.00
+
$13.99
+
Standard Carbine Buffer
Buffer-Carbine
$12.00
+
MFT Engage™ Pistol Grip
MFT Engage Grip
$19.99
Out-of-stock
$25.00
+
$10.00
+
Standard AR-15 Bolt Catch
Bolt-Catch-AR15
$5.00
+
AR15 Fire Control Group
AR15 Fire Control Group
$35.99
+
$4.00
+
MilSpec AR-15 Trigger Guard
MilSpec Trigger Guard
$4.00
+
Standard End Plate AR-15/M4
End Plate
$4.00
+
Safety Selector AR-15
Safety Selector
$11.00
+
Bolt Catch Plunger/ Rollpin/ Spring
Bolt Catch Spring Kit
$3.00
+