M4A1 FSP 5.56X45MM STRIPPED UPPER RECEIVER

M4A1 FSP 5.56X45MM STRIPPED UPPER RECEIVER Reviews & Ratings

This Daniel Defense M4A1 FSP AR15 style Upper Receiver Group was built for customers wanting a firearm inspired by USSOCOM SOPMOD Block II. It features the M4A1 FSP RIS II picatinny quad rail in Flat Dark Earth, a 14.5" M4 SOCOM heavy profile barrel, Mil-Spec F-Marked front sight base.

  • UPPER RECEIVER: Mil-Spec with Indexing Marks and M4 Feed Ramps. CNC Machined of 7075-T6 Aluminum, Type III Hard Coat Anodized
  • BARREL: Chrome Moly Vanadium Steel, Cold Hammer Forged, 1:7 Twist, 14.5" M4 SOCOM Heavy Profile, Chrome Lined, Mil-Spec Heavy Phosphate Coated, and HP/MPI Tested
  • GAS SYSTEM: Mil-Spec F-Marked Front Sight Base, Carbine Length, Direct Impingement
  • HANDGUARD: Daniel Defense M4A1 FSP Rail Interface System (RIS) II, CNC Machined of 6061-T6 Aluminum, Type III Hard Coat Anodized FDE
  • SIGHTS: Includes Daniel Defense A1.5 Fixed Rear Sight and A2 Front Sight Post in the F-Marked Front Sight Base
Made in the USA!

DOES NOT INCLUDE: Bolt Carrier Group, Charging Handle and Muzzle Device

See all of our AR15s and AR15 parts here.

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5 Stars
89%
4 Stars
11%
3 Stars
0%
2 Stars
0%
1 Stars
0%
Reviews Summary
The M4A1 FSP 5.56X45MM Stripped Upper Receiver garners strong praise for its solid construction, customization options, and good value. Many customers appreciate its performance and craftsmanship, although a few note minor issues like handguard alignment. Overall, it's recognized as a reliable choice for upgrades and personalizations.
What Reviewers Are Saying
Product Quality
85%
Reviewers consistently highlight the exceptional build quality of the upper receiver, with many noting its solid construction that can withstand rough handling. This theme indicates high customer satisfaction with material and craftsmanship.
Customization and Value
80%
Customers appreciate the flexibility of customizing the upper receiver with any muzzle device, praising it as a better value over complete uppers. This theme reflects the product's appeal for those looking to upgrade their setups without limitations.
Performance and Accuracy
75%
Several reviews mention excellent performance at the range, with good groupings using various optics and setups. Reviewers find it effective for suppressed shooting, emphasizing its strong performance track record.
Minor Construction Issues
30%
Some reviewers point out minor issues such as the handguard not being perfectly aligned with the receiver or other aesthetic discrepancies. While these concerns did not greatly diminish satisfaction, they indicate areas for potential improvement.
Aesthetics
40%
The upper's look is frequently praised, with customers noting that aesthetics play a significant role in their purchase decision. This shows that visual appeal coupled with performance is important to many buyers.
5
Tank Upper
I could not be more please with the purchase. To complete my build i added DD bcg just to keep things simple with Radiant Arms vented ambi charging handle. Straped to a LMT Mars lower which is the tank version lower. Currently running it loud with CMT muzzle/brake and no red dot or optics. Havent figured out what I want yet. I love my build and its extremely fun to take to the range.
Would you recommend this? Yes, I would recommend to a friend
5
EXCELLENT FOR MY GWOT BLOCK II BUILD
Cannot reccomend enough. Daniel Defense says it all but the FSP is exactly what I needed to build out my GWOT Block II. Would not have purchased anywhere other than Brownells. Excellent customer service & ALWAYS running very good coupons & discounts. Brownells is the best.
Would you recommend this? Yes, I would recommend to a friend
5
Love it, nothing can beat it
After putting it together with my ambi dd lower, it feels even better then ris3! I love my fsp upper
Would you recommend this? Yes, I would recommend to a friend
5
Solid. Comes with QD mount!
Very, very solid stripped upper. Paired with a BCM BCG, Radian Raptor, and ASR brake. No complaints whatsoever. For those wondering, mine did come with a QD sling mount already mounted at the 9 o'clock position. It shows it in pictures but doesn't mention it being included (or not included, for that matter) in the description.
Would you recommend this? Yes, I would recommend to a friend
5
Best value
This is simply THE MOST SOLID upper I've ever handled. You can feel it in the construction. It has some weight, you know you can bang this around and it wont flinch. I think this is a better value than the nonstripped upper because you can put any muzzle device on it, or direct thread your suppressor. The complete upper has a pretty useless muzzle devicr if you plan to suppressor. THIS upper on the other hand, its ready for complete customization. Not a single issue, blem, or misalignment with rails. I recommend getting a QD flash hider muzzle device put on, SBRing a lower so you can run it as is without worrying, and picking up some plastic picatinny rail ladder covers off aliexpress. While you're at it, throw in a surefire clone for less than $100. Havent grouped shots at 100 yards but this is one of the best deals I've found over the past year looking for a nice upper. This is a solid starting point. Make sure you run a decent trigger, bcg, maybe a vented raptor charging handle if you can afford it. You wont be disappointed!
Would you recommend this? Yes, I would recommend to a friend
5
The best
Daniel Defense is the best. This is also the best place to buy this considering the price. Don't forget, you need a muzzle device to keep the OAL over 16 inches unless you have a SBR lower.
Would you recommend this? Yes, I would recommend to a friend
5
Makes the boys jealous.
All my friends love it and my brother is envious of it. I only bought it because it looks cool. Aesthetics is king. Yeah, it shoots great, but 90% of the battle is looking cool.
Would you recommend this? Yes, I would recommend to a friend
5
Unbelievably accurate with a red dot at 100 yards
Superb craftsmanship and detail. Finally got it out to the range today and was getting, for me, very good groups with a zero magnified Aimpoint red dot at 100 yards. Shooting supressed and it's a very soft shooting gun. Daniel Defense must almost assume people are going to shoot suppressed.
Would you recommend this? Yes, I would recommend to a friend
5
Needed a quad rail fsp for ... vibes
Couldn't beat the price. Handguard was ever so slightly canted, but easy to loosen and fix.
Would you recommend this? Yes, I would recommend to a friend
5
Great deal, prompt shipping, packaged well
Really pleased with my whole experience from Brownells. This upper is awesome!!