Tag Archives: Suppressor

Thoughts on the Short Barreled AR15.

Some years back I decided I would convert one of my AR15s to a short barreled rifle.  After paying a 200 dollar tax stamp and waiting a long time, I started with a LMT 10.5 inch upper.

The first time I shot that short upper I decided I wanted a suppressor.  That ended up costing me a great deal of money.

That picture shows two products I ended up having issues with.  My Eotech 512 had the battery contacts fail on me.  I also found out that the threads on my LMT upper were not cut concentric to the bore.  That issue lead to a 10 minute of angle point of impact shift between suppressed and unsuppressed.

My first silencer was a Gemtech M4-02.  The can performed great but it was a thread on can.  Each time I screwed it on or off the rifle I was worried about damaging the threads and I had to keep a flash hider or thread protected around for when I wasn’t using the can.  So I did more research on suppressors and I ended up buying a Surefire 556K can.

I found I preferred using ACOG optics on my SBR.  The ACOG gave me better target recognition and the bullet drop chart aided in shooting farther distances.

In the above photo my rifle has a Surefire muzzle break.  That break stayed on my rifle for one whole range session.  I find the increased flash and blast of a muzzle break on a short barreled rifle not worth the minimal amount of reduced recoil.

Around the time I decided I would have to do something about the major point of impact shift with my LMT upper I found out about a new rail on the market, the Daniel Defense MK18RISII.  I bought one along with a 10.5 inch medium contour match barrel.

When the above photo was taken I was trying out an early production Magpul UBR.  Many people on gun forums were claiming this was the ultimate rifle stock.  I found it to be awkward and heavy and very quickly got rid of it.  They don’t seem to be that popular any more.

Since then I have had a SBR AR15 in 9mm, 5.45.  I also had a LWRC PSD in 5.56.  The pistol caliber carbines are fun, but lack the usefulness at longer distances.  The LWRC with its 8.5 inch barrel and piston system was heavier then my 10.5 inch direct impingement uppers.

The 10 inch 5.56 SBR is the shortest I prefer to go.  Shorter then that you give up a great deal in ballistics and terminal performance.  A longer rifle starts to get awkward when using a suppressor.

I really love the short barreled AR15, but it is not something I would recommend to everyone.  Unless you are using suppressors I don’t think SBRs are that worth while.  If your thinking about getting into a short barreled AR15, look at the Colt 6933 and the Colt 6945.  I’ve purchased a Colt 6945 and am eagerly awaiting it.

SHOT SHOW 2013: Daniel Defense ISR Marks their Entry into the Suppressor Market

The Daniel Defense ISR (Integrated Suppressor Rifle) is essentially a 10.3” SBR with a pinned/welded suppressor that they developed specifically for this rifle, bringing the total barrel length to over 16”.  This means you only need to purchase one NFA stamp to own this gun.  It does not require being registered as an SBR.  The forend is Daniel Defense’s new MFR which I found to be extremely comfortable.

As of right now, this model is only offered in AAC 300 blackout, with no word on future plans for other calibers.  They will begin accepting orders for this platform beginning of April and should start shipping around mid-May.  The MSRP is projected around $3199.

*As a side note, this year Daniel Defense will also be offering their new premium line of ammunition in 5.56 and .300BLK calibers.

Daniel Defense ISR

Suppressed Sig 556


I had the opportunity to examine and fire a suppressed Short Barreled Sig 556 with an AAC M4-2000 can.  I did not like that setup.  It’s owner pointed out that the mount of the AAC can prevented the gas system from being removed for cleaning.  When the rifle was fired, gas would vent from the gap between the Sigs upper and lower receivers, and blow upwards into the shooters face.  Later in the day, the owner of this rifle ended up having mechanical issue with his rifle.  He ended up having to take it home to disassemble it for cleaning and maintenance.

The SBR Sig556 and the AAC M4-2000 does not make for a good combination.