1 DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited. Presented by Jeff Johnson Weapons Department Ordnance Engineering Directorate.

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Presentation transcript:

1 DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited. Presented by Jeff Johnson Weapons Department Ordnance Engineering Directorate Naval Surface Warfare Center – Crane, Indiana – CQB Receiver – M4A1 Carbine with 10-Inch Upper Receiver

DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited. CQB Receiver M4A1 carbine with 10 inch barrel –Why a 10 ” barrel carbine? –What is the weapon configuration? –How was it tested? –How does it perform? –Questions?

DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited. Why a 10 ” barrel carbine? Minimize length and weight of primary weapon Retain reliability and performance of standard weapon Maintain interoperability of SOPMOD equipment Maximize current logistics chain

DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited. What is the configuration? National stock system parts No changes to lower receiver Gas port expanded from to inches

DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited. What are the differences? Barrel shortened to 10.3 inches

DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited. What are the differences? Standard 4-coil extractor spring replaced with 5-coil COTS spring IAW Navy engineering bulletin

DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited. What are the differences? Standard flash hider replaced with M4QD flash hider for suppressor compatibility

DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited. What are the differences? Replacement gas rings

DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited. How was it tested? 40,000 round test using 4 upper receivers fired 10,000 rounds each M855 ball ammunition 300 round firing cycle –2-4 round short bursts –4-6 round medium bursts –Barrel temperature kept below 1000 degrees F –Weapons cooled after each 300 round cycle Weapons cleaned/gaged every 600 rounds 10% suppressed Original gas rings replaced with COTS 1- piece rings at 5,000 rounds

DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited. Parts breakage and replacement WpnPartRound count Anone - Bextractor spring6300 gas tube6400 extractor6500 Cgas tube7200 Dgas tube9100 How does it perform?

DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited. How does it perform?

DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited. How does it perform? Gas port erosion

DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited. How does it perform? Barrel Temperature (°F) 713°F = max measured temp

DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited. How does it perform? Headspace (inches) 10,000 rd A B C D

DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited. How does it perform? Reliability (mean rounds between stoppage) WpnRoundsStoppagesMRBS A10, B10, C10, D10, Cum.41,

DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited. How does it perform? Accuracy (5 round group extreme spread in inches at 200 yd) 5,000 10,000 rd A B C D

DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited. How does it perform? Rate of Fire (rounds per minute) –unsuppressed WpnAvg – cleanAvg – dirty A B C D757659

DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited. How does it perform? Rate of Fire (rounds per minute) –suppressed WpnAvg – cleanAvg – dirty A B C D992986

DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited. How does it perform? Velocity (feet per second) –unsuppressed –clean weapon 10,000change A B C D

DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited. How does it perform? Velocity (feet per second) –unsuppressed –dirty weapon 10,000change A B C D

DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited. Questions???