Every part checked against this replica, grouped by category. The tag on each row says how well the answer is backed. Use the evidence filter to see only fits a maker or retailer has named.

CNC 6-Position Buffer Tube for GHK / WE / VFC M4 GBBRFitsRetailer
Angry Gun

Heavy Recoil Buffer for M4 / AR-15 / 416 GBBRFitsRetailer
VFC

SLR M4 GBB Buffer Tube AssemblyFitsRetailer
Dytac
Not compatible with Tokyo Marui MWS.

Stainless Recoil Kit for VFC M4 GBBRFitsRetailer
BBT

Front Charging M-LOK Handguard for WE / VFC / GHK M4 GBBRFitsRetailer
Maple Leaf
Front charging handle can be switched left or right.

TakeDown M-LOK Handguard for WE / VFC / GHK M4 GBBRFitsRetailer
Maple Leaf
Not compatible with HK416 series. Sold in 5.5", 9.5" and 12.5".

Workhorse M-LOK Free Float Handguard for VFC AR/M4 GBBRFitsRetailer
BAD
Includes a real-steel-spec barrel nut. 13.5" and 15".

APS-X Hop-Up System with Inner Barrel for VFC M4FitsRetailer
T.N.T.
Comes in 265mm and 455mm; match the outer barrel.

Magnus Pro TDC Hop-Up Chamber for VFC / GHK M4FitsRetailer
4UANTUM
Install with the included spacer on VFC.

OEM Complete Hop-Up Assembly (Guide Hop) for M4 GBBRFitsRetailer
VFC
Not compatible with VFC or Umarex HK416 GBB.

VIRGIA TDC Hop-Up Chamber for VFC / GHK M4FitsRetailer
Ceondoi

M4 V3 30rd Green Gas MagazineFitsRetailer
VFC

OEM NPAS Nozzle V2 for M4 V3 GBBRFitsRetailer
VFC