Does the CMMG MK4/ Forward Assist Armor work with the Lewis Machine & Tool 5.56MM?

Upper Receiver
CMMG MK4/ Forward Assist Armor
from $115.27

Charging Handle
Lewis Machine & Tool 5.56MM
from $97.20
CMMG upper and Lewis Machine & Tool charging handle compatibility
Yes, they fit
The CMMG MK4/ Forward Assist Armor works with the Lewis Machine & Tool 5.56MM. Our compatibility rules found no conflict between them.
This exact setup is in a real GunPartPicker build.
Counted from real GunPartPicker builds: parts lists people put together while planning to buy.
Checked by the same rules the AR builder runs on every part you add: caliber, frame size, receiver pattern, thread pitch and gas length.
Fit is judged from the specs retailers list, which can be missing or wrong. Confirm with the manufacturer before you buy, and have a qualified gunsmith check any build before you fire it.
How often builders pair the CMMG upper and Lewis Machine & Tool charging handle
Backed by tens of thousands of qualified builds that have both an upper and a charging handle.
Share of builds with the CMMG MK4/ Forward Assist Armor and any charging handle
- This pairLewis Machine & Tool 5.56MM33%
Share of builds with the Lewis Machine & Tool 5.56MM and any upper
- This pairCMMG MK4/ Forward Assist Armor5%
CMMG MK4/ Forward Assist Armor
- Of upper picks
- 0%
- Median paid
- $115
Lewis Machine & Tool 5.56MM
- Of charging handle picks
- 0.2%
- Median paid
- $89
How we count ⌄
These shares come from GunPartPicker's build data: real parts lists people put together while planning a purchase, not sales or surveys. A build counts a part only when it is the final pick for its slot, so parts that were swapped out never count. Fit never comes from these numbers; it comes from our compatibility rules alone.
Frequently built with the CMMG upper and Lewis Machine & Tool charging handle
The part builders pick most often in each slot alongside these two, checked against both. Parts that conflict are left out.
Barrel
Stock & Brace
Handguard
Muzzle Device
Lower Receiver

Sons Of Liberty Gun Works Stripped
Fits both
Pistol Grip
Buffer Tube Assembly
CMMG MK4/ Forward Assist Armor vs Lewis Machine & Tool 5.56MM: specs and prices
| CMMG MK4/ Forward Assist | Lewis Machine & Tool 5.56MM | |
|---|---|---|
| Best price | $115.27 at BattleHawk Armory | $97.20 at BattleHawk Armory |
| Stores | 0 of 2 in stock | 2 of 2 in stock |
| Assembly | Stripped | n/a |
| Platform | AR-15 | AR-15 |
| Receiver Type | A4 | n/a |
| Hand | n/a | Ambidextrous |
| Latch Style | n/a | Ambidextrous |
| Material | n/a | 7075-T6 Aluminum |
| Color | n/a | Black |
| Finish | n/a | Hardcoat Anodized |
Both for $212.47 at today's best prices.
Today's best prices and 90 day price history
Every store we track for each part, cheapest in stock first. Prices are checked through the day.
Price history, last 90 days
- CMMG MK4/ Forward Assist Armor: lowest $115.27 on Jul 5, highest $129.79 on Jul 26 over the last 90 days.
- Lewis Machine & Tool 5.56MM: lowest $89.10 on Jul 6, highest $100.35 on Jul 5 over the last 90 days.
Charging Handles most paired with CMMG uppers
The CMMG MK4/ Forward Assist Armor is not in enough builds yet, so these are the most picked next to any CMMG upper. Only parts our rules say fit the CMMG MK4/ Forward Assist Armor are listed.
Upper Receivers frequently paired with the Lewis Machine & Tool 5.56MM
Most picked next to it in real builds. Only parts our rules say fit the Lewis Machine & Tool 5.56MM are listed.





















