AR-15 Podcast 203 - Short Barreled Rifles

Welcome to Episode #203 of the AR15 Podcast. On this episode we’re talking about SBR’s

Support the show at

Our thanks to JWB Military & Brass for sponsoring tonight's main topic.  Go to and use promo code ARP10 for 10% off of quality once fired military reloading brass, AR-500 steel targets, and more.

RTT - Giveaway - SBR - Anthony not included in the giveaway

Glock slide special $49.99 single color slide only.  - RTT       

Main Topic:

Reed -

JD - MP5 - TPM- Outfitters

RTT Firearms SBR Giveaway -

Mil-spec forged upper and lower

12 inch billet rail m-lok

Magpul furniture

10.5 inch barrel with under rail flash hider    

Two tone distress paint job

Caliber 5.56/.223

Short-barreled rifle (SBR) is a legal designation in the United States, referring to a shoulder-fired, rifled firearm, made from a rifle, with a barrel length of less than 16 in (41 cm) or overall length of less than 26 in (66 cm). In the United States, an SBR is an item regulated by the Bureau of Alcohol, Tobacco, Firearms and Explosives (BATFE) as a Title II weapon. In the absence of local laws prohibiting ownership, American civilians may own an SBR provided it is registered with the BATFE, and a $200 tax is paid prior to taking possession of or creating the firearm.

The regulation of short-barreled rifles was the result of the National Firearms Act of 1934 which also imposed restrictions on short barreled shotguns, silencers and machine guns.

When an individual wishes to build a short-barreled rifle, he or she must beforehand submit a completed BATFE Form 1

Feed Back -

DW Taylor - Since Reed is such a fanatic on Iron Sights, I had to throw him a bone!  I'm building a black rifle chambered for the 6.5 Grendel. This will be used with a magnified optic, but I also want backup iron sights. 20 inch barrel, low profile gas block, rifle length. I want to put a free floating handguard on it, probably either Brigand Arms carbon fiber or similar style.

I'm wondering how the accuracy of iron sights on a free floating handguard is compared to sights mounted directly to the barrel.

Also, what buffer weight should be used with this? I have a PSA Magpul MOE mil-spec lower build kit that I'm using, but should I use a heavier buffer? Should the buffer spring be changed as well? What's the downside of using mil spec buffers with a heavier round?

Thanks again for a very informative and enjoyable show.  I'm still working on my lowers collection, but do I really need 83?  So far I am only at 18% of that target.

Michael M. - Show 197 Barrel Temp, Listening to the show a comment was made that after firing 300+ rounds in three minutes that the modified barrel temp was 207 degrees and that a conventional barrel would be 1500 degrees kelvin. 207 kelvin is about 100 degrees below zero (-100 F). Just wondering if you were implying 207 Celsius (500 ish kelvin). Just curious as even reducing the temp by half is impressive.

David L. - Evening Gentlemen, when ya'll were reviewing Shot Show and speaking of a target viewing system not using a spotting scope.
I think Anthony mentioned it. Also saying that a techie kind of guy could make one himself.

Remember that? Could you point me in the right direction to do something like that? I don't like spotting scopes and find it hard to spot 5.56 holes 300 yds or further downrange.

Thanks Guys. Enjoy the Podcast and I am learning, not to my Gunsmith Son's level yet, but ya'll are my tutors and bringing my knowledge level up behind his back.


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