5" 5.56 NATO UPPER ASSEMBLY (BUILT)

Price is great on top of the quality of the upper being very good (usually when buying something with low price on it you dont get something of this quality so big plus) and they got my order put out really fast considering how high the demand is on these uppers. Customer support 10/10 joel is who helped me and he was great! 20/10 fully recommend

Two thumbs up

Very satisfied with my 5" 5.56 Nato upper purchase from MCS. The quality of the product is very high

Good toy gun for the range finna add the 3.5 buffer for my build

I just wanted to pop back in eight of these later and say that long term performance has been excellent. On my first two orders the shipping was a bit wonky, with one ending up visiting Puerto Rico for a few days, but then it occurred to me that this area had a little bit of a storm and didn't even have a functional post office for a bit. That has improved immensely.
Customer service is beyond amazing. If you have a question an actual person answers the phone. Again, products, service, and more recently shipping times are all A++++++

Build quality and finish are good. I like the adjustable gas. Had a delay on my order and customer service called me, explained the situation and gave me an extra coupon code. Can't ask for anything more. Thinking of ordering a 300 BO too!

Was kind of skeptical about the site not going to lie to you but after calling and doing some research about the site not going to hold you man I’m officially addicted to the site??? 10/10 good customer service always answer if you have any questions the only thing that sucks is the waiting for your package but usually gets shipped pretty fast within 4-5 days

After building out a lower with the MCS 3.5" buffer, my 7.5" PSA Marauder seemed just a bit too long. Enter this beast. The OAL of the gun comes in at 17" and the function is flawless. Thanks for another great product.

New 5 inch barrel for my current project Pistol, also have three 3 1/2 inch buffer. Can’t wait to go to the range.