Aero Precision Replacement Spring / Detent Oops Kit (AR-15 / AR-10)

Aero Precision Replacement Spring / Detent Oops Kit (AR-15 / AR-10)

Product Code:
Calculated at Checkout

MPN: APRH101627


  • Fits all standard lower receivers
  • Features the most commonly lost parts
  • High quality with competitive pricing


  • AR-15, AR-10, M4E1 and M5


  • 2x Bolt Catch Roll Pin
  • 2x Buffer Retainer
  • 2x Buffer Retainer Spring
  • 2x Safety Selector Detent
  • 2x Safety Selector Detent Spring
  • 4x Pivot/Takedown Pin Detent
  • 4x Pivot/Takedown Pin Detent Spring
  • 2x Trigger/Hammer Pin
  • 2x Disconnector Spring
  • 2x 4-40 Set Screw (for threaded takedown in detent hole)


The Aero Precision oops kit is a necessity for the shooting bag of all AR15 owners who want to take their preparedness to the next level.

The Aero Precision Oops Kit Comes In Handy At The Shooting Range

This AR oops kit includes parts that are commonly broken or misplaced. Next time you are at the range and you experience a break, by having this kit in your shooting bag, you can be back to practicing in minutes.

The Aero Precision Oops Kit Is Useful At Home

When you are cleaning your AR-15 at home after getting in some range time, if you lose a piece you will be able to reassemble your weapon immediately. This helps you achieve optimal defense readiness and allows you to search for the missing part when time permits.

Should you be building an AR15, this kit is also great to have available; you never know when you might need an extra part.

What AR-15s Are Compatible With This AR Oops Kit?

Aero Precision manufactured this kit for the .300 Blackout and the 5.56x45mm AR15. The parts included in the kit are also compatible for M5 and M4E1 builds.

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21 Reviews

  • Aero Precision Oops Kit

    Posted by Ryan Hensley on 1st Apr 2021

    Great stuff. Well made. Fast shipping.

  • You cant go wrong with aero precision

    Posted by Carlos Gaxiola on 28th Mar 2021

    Aero precision doesnt disappoint

  • Great kit

    Posted by Rudy on 5th Feb 2021

    Great kit to have as spares...never know when you are going to need a spring...


    Posted by JOHN DOE on 8th Dec 2020

    Everything pictured was accounted for and worked like it should.

  • Life Saver

    Posted by Ernest Atwood on 8th Dec 2020

    Aero Precision knows the AR platform, and more importantly understands what we need. If you’ve ever built, are going to build, or even disassemble an AR, you need this kit. You won’t be sorry.

  • Good for Building

    Posted by Peter McCully on 3rd Jul 2020

    Good quality springs and pins for a build. I build ARs piece by piece instead of buying LPK to really get things set up how I like, and this kit covers 80% of the little stuff. My only complaint is no magazine spring, bolt catch spring or plunger. To it's credit, that's not what its for anyway.

  • Aero Precision spring & detent kit

    Posted by Pete Simonson on 17th Jun 2020

    These were purchased as 'spares' - I have not used any as of yet, but they appear to be well made. Price was very good.

  • Oops kit for AR

    Posted by Joseph on 10th May 2020

    Theses oops parts are really good and affordable .

  • OOPS Kit

    Posted by William on 5th May 2020

    This is a must have. Nothing more frustrating than searching for dropped small parts. Wing Tactical always has great prices and fast shipping!

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