Ark Charging Handle (Riptide) 
GU-37 Kit – 37mm Signaling Device
Parts kit for the GU-37. A portion of sales will be donated back to the developer, GoonGunDesigns.
Everything you need to complete the GU37 **Fencepost included!**
Per the GU37 Guide:
Any AR lower receiver will work with the GU-37, however the buffer tube
attachment point must be selected to accommodate the selected bolt system
IMPORTANT:
- Kit does not ship to NJ or International.
From $69.99
Barrel Options
Pistol Length - 13.9 cm
$0.00
10 in stock
Pistol Length w/ Muzzle Brake (17.4cm)
$3.00
7 in stock
Rifle Length w/ Muzzle Brake (31.4cm)
$9.00
8 in stock
Rifle Length (29.7cm)
$6.00
7 in stock
Bolt Options
Standard Bolt
$0.00
7 in stock
Bufferless Bolt
$20.00
9 in stock
9 in stock
We offer:
- Quality Assurance All our Kits are backed by our 100% Quality Guarantee.
- Delivery Policy We ship our products via USPS to save you money.
Description
| STANDARD KIT | AMOUNT |
| m5x5mm cup point set screw | 8 |
| m3x6mm cup point screw | 1 |
| m5x18mm flat head screw | 2 |
| m5 nylock washer | 2 |
| m4x25mm Socket Head Screw | 2 |
| m4x30mm Socket Head Screw | 1 |
| m5x30mm socket head screw | 3 |
| 9mm OD, 3.2 ID Washer | 1 |
| m3x30mm stainless steel rod | 2 |
| ar15 magazine catch spring | 2 |
| 3/8″x40.5mm | 1 |
| m5x12mm socket head screw | 1 |
| m5x30mm button head cap screw | 1 |
| m5 nut | 1 |
| m5 nut thin | 1 |
| m3 nut | 1 |
| m4x16mm socket head screw | 2 |
| m3x18.5mm stainless steel rod | 1 |
| m3x75mm threaded rod | 1 |
| Fencepost | 1 |
| BUFFERLESS BOLT | AMOUNT |
| 0.18″ OD, 0.13″ IDx279.4mm spring | 2 |
| M3x173.8mm | 3 |
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