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Questions & Answers
Can this shoot a 5.56 Expert Answer

Yes, these are 5.56 upper receiver.

by Nick B., Gear Expert, October 29, 2021
Is your slim rail same contour as the Picitinny rail? Expert Answer

The slim handguard is thinner in diameter than the quad rail handguard, but it does still have a full picatinny rail on top.

by Ethan C., Gear Expert, February 14, 2019
Customer Reviews
Helpful Positive Review Quality as expected So Far by Reviewer, April 9, 2018
I’ve always trusted Optics Planet to provide great service! This experience is no different than any other that I have had with them. Great! Now, I’ve only taken this upper to the range one time since I got it about a week ago. I can say that it func...
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1/1 found this helpful
Most Recent Reviews Good quality for budget build. by Ed, March 31, 2019
1st time buying a Radical Firearms upper. Upper came nicely bagged, covered in heavy oil, inside in a foam padded box. The barrel and bolt are nitrided so that is a plus. Loved the FCR handguard, very light. However, here are my gripes: 1. The color...
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Read All 2 Reviews
Caliber: 5.56x45mm NATO Barrel Length: 16 inFinish: Anodized Color: Black Gun Model: M4 Condition: New Gun Rail: M-LOK Additional Features: Slim Rail System (FCR) Length: 15 inModel: Slim Rail System (FCR)

Code: 2CS-UFH-16556M4-CFU16-5-56M4-15FCR

MPN: CFU16-5.56M4-15FCR

UPC: 816903025381

Product No Longer Available

Product Info for Radical Firearms Complete Upper Assembly 16 inch 5.56 M4 Contour, A2 Flash Hider, w/BCG and CH

Radical Firearms Complete Upper Assembly 16 inch 5.56 M4 Contour, A2 Flash Hider, w/BCG and CH has one of the longest in the industry making this rifle complete. The 16" M4 contour barrel has M4 profile and is the same one that is found on AR-15 rifles. The upper receiver is complete with bolt carrier assembly, charging handle, forward assist, ejection port door and bolt, it also comes with a two-piece heat shield and ejection port cover. Radical Firearms is always looking to partner with quality manufacturers that are serious about what they do. You won't be disappointed.image

Package Contents:

  • Radical Firearms Complete Upper Assembly 16 inch 5.56 M4 Contour, A2 Flash Hider, w/BCG and CH

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Radical Firearms Complete Upper Assembly 16 inch 5.56 M4 Contour, A2 Flash Hider, w/BCG and CH Unavailable & Discontinued Models

List of Unorderable Models

Radical Firearms Complete Upper Assembly 16 inch 5.56 M4 Contour, 15 inch FCR, A2 Flash Hider, w/BCG and CH, Black, CFU16-5.56M4-15FCR , MPN: CFU16-5.56M4-15FCR , UPC: 816903025381 , Code: 2CS-UFH-16556M4-CFU16-5-56M4-15FCR
Radical Firearms Complete Upper Assembly 16in 5.56 M4 Contour, 1/7 Twist, 10in FCR, M-LOK, A2 Flash Hider, Black, CFU16-5.56M4-10FCR , MPN: CFU16-5.56M4-10FCR , UPC: 816903025367 , Code: 2CS-UFH-16556M4-CFU16-5-56M4-10FCR
Radical Firearms Complete Upper Assembly 16in 5.56 M4 Contour, 1/7 Twist, 10in FGS, MOE, A2 Flash Hider, Black, CFU16-5.56M4-10FGS , MPN: CFU16-5.56M4-10FGS , UPC: 814034029865 , Code: 2CS-UFH-16556M4-CFU16-5-56M4-10FGS
Radical Firearms Complete Upper Assembly 16 inch 5.56 M4 Contour, 12 inch FCR, A2 Flash Hider, w/BCG and CH, Black, CFU16-5.56M4-12FCR , MPN: CFU16-5.56M4-12FCR , UPC: 816903025374 , Code: 2CS-UFH-16556M4-CFU16-5-56M4-12FCR
Radical Firearms Complete Upper Assembly 16in 5.56 M4 Contour, 1/7 Twist, 10in FQR ,QUAD PICATINNY , A2 Flash Hider, Black, CFU16-5.56M4-10FQR , MPN: CFU16-5.56M4-10FQR , UPC: 816903020522 , Code: 2CS-UFH-16556M4-CFU16-5-56M4-10FQR
Radical Firearms Complete Upper Assembly 16in 5.56 M4 Contour, 1/7 Twist, 10in RPR, M-LOK, A2 Flash Hider, Black, CFU16-5.56M4-10RPR , MPN: CFU16-5.56M4-10RPR , UPC: 816903023936 , Code: 2CS-UFH-16556M4-CFU16-5-56M4-10RPR
Radical Firearms Complete Upper Assembly 16in 5.56 M4 Contour, 1/7 Twist, 12in RPR, M-LOK, A2 Flash Hider, Black, CFU16-5.56M4-12RPR , MPN: CFU16-5.56M4-12RPR , UPC: 816903023943 , Code: 2CS-UFH-16556M4-CFU16-5-56M4-12RPR
Radical Firearms Complete Upper Assembly 16in 5.56 M4 Contour, 1/7 Twist, 15in RPR, M-LOK, A2 Flash Hider, Black, CFU16-5.56M4-15RPR , MPN: CFU16-5.56M4-15RPR , UPC: 816903023950 , Code: 2CS-UFH-16556M4-CFU16-5-56M4-15RPR
Radical Firearms Complete Upper Assembly 16in 5.56 M4 Contour, 1/7 Twist, 9in FHR, KEYMOD, A2 Flash Hider, Black, CFU16-5.56M4-9 FHR , MPN: CFU16-5.56M4-9 FHR , UPC: 816903020539 , Code: 2CS-UFH-16556M4-CFU16-5-56M4-9-FHR
Radical Firearms Complete Upper Assembly 16 inch 5.56 M4 Contour, 15 inch MHR, A2 Flash Hider, w/BCG and CH, Black, CFU16-5.56M4-15MHR , MPN: CFU16-5.56M4-15MHR , UPC: 816903023929 , Code: 2CS-UFH-16556M4-CFU16-5-56M4-15MHR
Radical Firearms Complete Upper Assembly 16in 5.56 M4 Contour, 1/7 Twist, 10in FTR, KEYMOD, A2 Flash Hider, Black, CFU16-5.56M4-10FTR , MPN: CFU16-5.56M4-10FTR , UPC: 816903020546 , Code: 2CS-UFH-16556M4-CFU16-5-56M4-10FTR
Radical Firearms Complete Upper Assembly 16in 5.56 M4 Contour, 1/7 Twist, 9in MHR, M-LOK, A2 Flash Hider, Black, CFU16-5.56M4-9 MHR , MPN: CFU16-5.56M4-9 MHR , UPC: 816903023905 , Code: 2CS-UFH-16556M4-CFU16-5-56M4-9-MHR
Radical Firearms Complete Upper Assembly 16in 5.56 M4 Contour, 1/7 Twist, 12in MHR, M-LOK, A2 Flash Hider, Black, CFU16-5.56M4-12MHR , MPN: CFU16-5.56M4-12MHR , UPC: 816903023912 , Code: 2CS-UFH-16556M4-CFU16-5-56M4-12MHR
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