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m4a1

The M4 carbine is a shorter and lighter variant of the M16A2 assault rifle. The M4 is a 5.56×45mm NATO, air-cooled, Stoner expanding gas system (commonly misidentified as direct impingement), gas-operated, magazine-fed carbine. It has a 14.5 in (370 mm) barrel and a telescoping stock.
The M4 carbine is extensively used by the United States Armed Forces and is largely replacing the M16 rifle in United States Army and United States Marine Corps combat units as the primary infantry weapon and service rifle.
The M4 is also capable of mounting the M203 and M320 grenade launchers. The distinctive step in its barrel is for mounting the M203 with the standard hardware. The M4 has semi-automatic and three-round burst firing modes (like the M16A2 and M16A4), while the M4A1 has semi-automatic and fully automatic firing modes (like the M16A1 and M16A3).

View More On Wikipedia.org
Recent contents
  1. BlkBearActual

    Daniel Defense M4A1 blockii Upper For Sale

      1. For Sale
    • $1000
    • Kirkland
    • Washington
    Good morning afternoon or evening whenever you are reading this. For sale is a Daniel Defense 14.5 M4A1 Block ii Upper That means its a daniel defense upper receiver with their cold hammer forged chrome lined barrel and the Risii Handguard The Surefire Muzzle Break is NOT pinned so you can...
  2. Aero Denezol

    Trijicon ACOG 4x32 .223 BDC M4A1 TA01NSN Amber Reticle mfg. 2021 * FREE SHIP

      1. For Sale
    • $750
    • Salem
    • Oregon
    Trijicon 4x32 ACOG in excellent condition, manufactured in June of 2021. This model lights up in low light or darkness and has a black reticle in daylight and has back-up iron sights along the top. The clarity of the glass is incredible. Includes Trijicon screw for carry handle mount and...
  3. Local Loader

    Done  Stripped lower receivers M4A1 $40

    PSA M4A1 Stripped Lower Receivers $40 https://palmettostatearmory.com/psa-m4a1-stripped-lower-receiver.html
  4. TheRealMP

    Vintage Colt M4 Upper

      1. For Sale
      2. For Trade
    • $600
    • Post Falls
    • Idaho
    Colt Upper with Colt BCG. 1/9 twist HBAR barrel.
  5. Chris12612

    Daniel Defense M4a1 Socom Upper

      1. For Sale
    • $900
    • Sandy
    • Oregon
    Daniel Defense M4a1 Socom 14.5" Upper Daniel Defense bcg Pri Gas Buster charging handle Surefire 4 prong p/w Surefire M952V Cloud Defensive tape switch mount Low round count $900 cash
  6. Aero Denezol

    B5 Systems SOPMOD stock for mil-spec tube * Free Ship

      1. For Sale
    • $60
    • Salem
    • Oregon
    B5 Systems SOPMOD stock w/ water-tight storage compartments. Used in perfect working condition. Light wear and/or handling marks, cosmetic only. Pickup FTF in Sale M-F between 7am and 3pm or free shipping by USPS Ground Advantage in the Pacific Northwest. Cash/VenMo/CashApp all okay. PayPal...
  7. Aero Denezol

    **PRICE DROP** Trijicon ACOG 4x32 .223 BDC M4A1 TA01NSN Amber Reticle mfg 2021 * FREE SHIP

      1. For Sale
    • $700
    • Salem
    • Oregon
    Used fixed power scope in excellent condition, manufactured in June of 2021. This model lights up in low light or darkness and has a black reticle in daylight and has back-up iron sights along the top. The clarity of the glass is incredible. Includes Trijicon screw for carry handle mount. I...
  8. R3nd3r

    Daniel Defense M4A1 14.5 P/W Upper

      1. For Sale
    • $900
    • Glendive
    • Montana
    I have this Daniel Defense M4A1 14.5 Upper (pin and welded) up for sale. Comes with DD BCG and CH included. I bought this upper and liked it, but now I want a shorter build. I put only about 50 rounds through it. Selling this for $900 OBO, Not interested in trades. Will ship at your cost.
  9. Patriot1776

    M4A1 SOCOM UPPER RECEIVER 14.5IN 5.56 Trade for DD MK18 upper

      1. For Trade
    • $0
    • Cornelius
    • Oregon
    I am currently trying to trade my Daniel Defense M1A1 Upper receiver less than 200 rounds ran through it. Only down side is the upper is pined and welded to Surefire Warcomp. I was going to run a rc2 on it but changed my mind . I’m currently looking to trade for a DD MK18 Upper. I could possibly...
  10. ImNotV3ryNinja

    WTB-M4A1 block I upper

      1. Want to Buy
    • Canby
    • Oregon
    Looking for an M4A1 block I clone upper preferably either Colt, BCM, DD Interested in those brands in that order. 14.5 Fsb Quadrail
  11. JimboPDX

    Daniel Defense M4A1 SOCOM NIB (price is negotiable)

      1. For Sale
    • $2000
    • Portland
    • Oregon
    I have a brand new unfired DDM4A1 SOCOM (w/ quad rails) up for sale. This rifle includes a hard case with the original documents, components, and a Daniel Defense factory 32 rd magazine. It comes equipped with a Geissele SSP trigger and metal pmag MBUS PRO flip up finger adjustable sights...
  12. coolio5k

    Complete Daniel Defense M4A1 upper

      1. For Sale
    • $950
    • Dallas
    • Oregon
    Looking to sell my Brownells exclusive Daniel Defense M4A1. These have a 14.5" carbine length gas, socom profile barrel. This is the model - https://www.brownells.com/gun-parts/rifle-parts/rifle-receivers-parts/m4a1-stripped-socom-upper-receiver-14.5in-5.56/?sku=100040692 I had a Surefire...
  13. Willynuggz

    Colt detachable carry handle

      1. For Sale
      2. For Trade
    • $60
    • Rainer
    • Oregon
    Marked: [ ] Colt M4/A4 Detachable Carry Handle is the same component used on military issued carbines and rifles. Mil-Spec rear sight features elevation adjustment up to 600 meters (marked 6/3). Standard A2 style adjustments allow for easy windage and elevation changes. Rear peep features the...
  14. tenthousand

    Aero M4A1 Clone Lower Complete - NEW in the box

      1. For Sale
    • $200
    • Portland
    • Oregon
    I very recently purchased this Aero M4A1 complete clone lower. I decided not to complete the project. My loss - your gain. Note: these lowers are marked SAFE, SEMI, AUTO to be clone correct. This is out of stock on Aero's website. They have it listed for $275.00. *I guess they are back in...
  15. Phillyfresno

    Dream Team for Sale, SR-15 & M4A1

      1. For Sale
    • $1
    • Brookings
    • Oregon
    Selling one to keep the other. Hit some hard times. 1) KAC SR-15 gen 1 lower fitted with KAC ambi safety, KAC Ambi Mag Release, KAC Combat Trigger Guard, LMT Buffer tube with KAC Buffer, Geiselle SSP. Upper is complete KAC Mod2 Mlok 14.5” P/W with KAC Barricade stop, KAC Mlok Rail section...
  16. bad pony

    FS/FT Daniel Defense 14.5" M4A1 upper receiver group

      1. For Sale
      2. For Trade
    • $800
    • Beaverton
    • Oregon
    I have a BNIB Daniel Defense M4A1 upper receiver group. Manufactured June 2023, complete with CH and DD BCG. Never mounted or fired by me, although I believe DD does test fire these. RIS II handguard in their FDE with DD rail covers. Pin and weld 14.5" barrel with DD's flash hider. Comes in its...
  17. Bluerock

    Daniel Defense M4A1 FSP Upper

      1. For Sale
    • $1200
    • Happy Valley
    • Oregon
    Selling my Daniel Defense M4A1 FSP Upper. Only shot once! Upper is in practically new condition. 14.5" pinned and welded with Surefire 3-prong flash hider. Comes with classic ladder rail covers. Comes with ambidextrous charging handle. Asking price is $1200. Willing to meet in public...
  18. Aero Denezol

    Midwest Industries Gen 2 Two Piece Drop-In Quad Rail * Free Ship

      1. For Sale
    • $79
    • Salem
    • Oregon
    Lightly used in excellent condition. I am the original owner, purchased new in 2022. Some minor rubbing of finish from rail covers sliding on/off. Cosmetic wear only, does not affect function. Free ship by USPS in the PNW. Or pick up FTF at my shop in Salem M-F 7am-3pm. Weekend meet-ups...
  19. Aero Denezol

    Troy Industries 7" MRF CAR/M4 Drop-In Battle Rail 2-Piece Quad Rail Handguard Carbine Length * Free Ship

      1. For Sale
    • $65
    • Salem
    • Oregon
    Lightly used in excellent condition, includes factory screws. I am the original owner, purchased new in 2022. Free ship in the PNW by USPS or pick up FTF at my shop in Salem M-F 7am-3pm. Weekend meet-ups possible for members with established feedback. Cash/Check/MO/Venmo/CashApp all good...
  20. lesionking

    Aero Precision/Daniel Defense M4A1

      1. For Sale
    • $1500
    • beaverton
    • Oregon
    I have a complete FDE Daniel Defense 14.5” upper, pin/welded A2 birdcage, Midwest industries rear sight and Troy front sights, and a tangodown stubby foregrip . The lower is a brand new aero precision M4E1 lower with magpul Moe+ pistol grip, ambi safety selector, CTR stock, and a Geissele SSA...
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