Shop now and get Free Value Shipping on most orders over $49 to the
contiguous 48 states, DC, and to all U.S. Military APO/FPO/DPO addresses.
Enjoy our FREE RETURNS
We want to ensure that making a return is as easy and hassle-free as possible! If for any
reason you are not satisfied with your purchase, simply return the item within 30 days of
receipt, and we'll cover the cost of return shipping. Learn more about our Return Policy.
Please Enable Your Browser's Cookies Functionality
Cookies are not currently enabled in your browser, and due to this the functionality of our site will be severely restricted.
Web browser based cookies allow us to customize our site for you, save items in your cart,
and provide you with a great experience when shopping OpticsPlanet.
Your privacy is important to us, and any personal information you supply to us is kept strictly confidential.
If you cannot enable cookies in your browser, please contact us — we are always here to help!
JavaScript is blocked by AdBlocker or ScriptBlocker
We're sorry - it looks like some elements of OpticsPlanet are being disabled by your AdBlocker.
Unfortunately we are unable to offer our excellent shopping experience without JavaScript.
Please add "opticsplanet.com" and "https://opl.0ps.us/assets-4198356f649/" to whitelist,
or disable AdBlocker for this site (please note that we do NOT feature any annoying ads on this website).
Thanks!
Your Browser is Outdated
Unfortunately, we are unable to provide an excellent shopping experience on your browser because it lacks modern functionality needed for us
to provide a fast, secure, and enjoyable experience. If you cannot upgrade your browser or use an alternative device to visit us,
please contact us at +1-800-504-5897 and we'll be happy to assist you over the phone!
Primary Weapons Systems MK1 MOD 1-P Upper Receiver MK1-M1U-223-14-PW Caliber: .223 Wylde, Overall Length: 23 in, $80.00 Off w/ Free S&H
Special offer available for this product! Chat with us and mention RAD
*Clearance and Blazin' Deal models do not qualify
Limited Time Offer. Click here to see!
Limited Time Offer! Order Now
You've been selected to receive a special discount on this product. Use the applicable coupon code at checkout to claim your offer.
These savings won't last, so don't delay! Limited time only. Cannot be combined with other promotions or offers.
Primary Weapon Systems M114UA01-1F MK116 223 Wylde 16 Inch 4140
1 of 1 images
Primary Weapon Systems M114UA01-1F MK116 223 Wylde 16 Inch 4140
Hence it's description as a "long stroke" piston system. The best way to describe it is to describe what you see when you remove the BCG. It is attached to a long rod which ends with a removable piston that sits inside the exhaust chamber. Short stroke systems normally just cause push a rod which sits inside the receiver, to knock rather than blow the bolt back. These PWS systems are, in most opinions, far superior for many reasons. You'll need to look up that info. You won't go wrong with PWS.
I just got the upper a week or so ago and so far it has been 100%. I do not have a high round count through it since I just got it, but it is a very smooth cycling upper and it fits with no wiggle on my Spikes lower. I believe these P models are supp...
Read More...
Great product. I have several. If you want something special with great quality And reliability look no further. PWS is my PWS. you will appreciate it if you get one.
This is my 5th PWS upper and I absolutely love it. They are the best AR's for the money hands down. Love the piston system for suppressing and all have been extremely accurate. I pair them with the mod 2 lower and they are fairly light as well. I've ...
Read More...
ATTENTION! We currently do not ship this product to P.O. Boxes, AK, CA, CT, DE, HI, MA, NJ, NY, U.S. Territories, or select Colorado locations. Please see our policies for more information or a detailed list of locations.
Product Info for Primary Weapons Systems MK1 MOD 1-P Upper Receiver
Get the most out of 5.56mm NATO and .223 Remington with the Primary Weapons SystemsMK114MOD 1-MUPPER .223 WYLDEUpper Receiver! These AR15 Upper Receivers will give you the AR15 build you've been dreaming of. This complete upper includes all kinds of proprietary extras like the PWSLong Stroke Piston System and PWS Piston Upper. The PWSM-Lokhandguard allows you to add any lights or attachments your heart desires. Now's the time, go Wylde!
Available with or without a compensator.
Specifications for Primary Weapons Systems MK1 MOD 1-P Upper Receiver:
Product Color:
Black
Features of Primary Weapons Systems MK1 MOD 1 Upper Receiver:
ADJUSTABLE GAS BLOCK
SMOOTH RECOIL IMPULSE
THE PWS LONG STROKE PISTON
Package Contents:
Primary Weapons Systems MK1 MOD 1-P Upper Receiver
Primary Weapons Systems MK1 MOD 1-P Upper Receiver Orderable Models
List of Orderable Models
Primary Weapon Systems MK116 223 Wylde 16 Inch 4140 Steel Chrome-Lined Black Hard Coat Anodized Barrel Finish, MK1-M1U-223-14-PW, MPN: MK1-M1U-223-14-PW, UPC: 811154033475, Code: 2D5-UFH-MK1MOD1-MK1-M1U-223-14-PW
Primary Weapons Systems MK1 MOD 1-P Upper Receiver Unavailable & Discontinued Models
List of Unorderable Models
Primary Weapons Systems MK1, MOD 1 - P Upper Receiver, 16.1 in Barrel, 12.75 in KeyMod Rail, FSC 556, Black, .223 Wylde, M116UA0B, MPN: M116UA0B, Code: 2D5-UFH-MK1MOD1-M116UA0B
Primary Weapons Systems MK111 MOD 1 - P Upper Receiver, 11.85 in Barrel, 10 in KeyMod Rail, Triad 556, Black, .223 Wylde, M111UA0B, MPN: M111UA0B, Code: 2D5-UFH-MK1MOD1-M111UA0B
Primary Weapons Systems MK107 MOD 1 - P Upper Receiver, 7.75 in Barrel, 7 in KeyMod Rail, Triad 556, Black, .223 Wylde, M107UA0B, MPN: M107UA0B, Code: 2D5-UFH-MK1MOD1-M107UA0B
Primary Weapons Systems MK116 MOD 1 - P Upper Receiver, 16.1 in Barrel, 12.75 in KeyMod Rail, FSC 30, Black, .300BLK, M116UB0B, MPN: M116UB0B, Code: 2D5-UFH-MK1MOD1-M116UB0B
Primary Weapons Systems MK111 MOD 1 - P Upper Receiver, 11.85 in Barrel, 10 in KeyMod Rail, Triad 30, Black, .300BLK, M111UB0B, MPN: M111UB0B, Code: 2D5-UFH-MK1MOD1-M111UB0B
Your Browser is Outdated
