LAR Grizzly OPS-4 Upper Receiver

by 702Shooter on · 7 comments

IMG 00011 200x133 LAR Grizzly OPS 4 Upper ReceiverOne of the goals I had hoped to achieve during the 2010 SHOT Show was to find a better solution for building side charging AR-15′s.  I already have one from Young Manufacturing but to be perfectly honest, the Y/M product is more of an afterthought than something that was designed specifically for this purpose.   While Y/M is taking standard components and modifying them to work as a side charging unit, LAR Grizzly has been busy designing a completely new series of side charging upper receivers from the ground up.  As you can imagine, I was very pleased when I stumbled upon their display, this past January, and discovered the OPS-4 Upper Receivers.

IMG 0004a 200x133 LAR Grizzly OPS 4 Upper Receiver IMG 0005a 200x133 LAR Grizzly OPS 4 Upper Receiver IMG 0008a 200x133 LAR Grizzly OPS 4 Upper Receiver
IMG 00121 200x133 LAR Grizzly OPS 4 Upper Receiver IMG 00131 200x133 LAR Grizzly OPS 4 Upper Receiver IMG 00141 200x133 LAR Grizzly OPS 4 Upper Receiver

The OPS-4 line consists of  right side, left side, and ambidextrous options as well as the standard flat top, high ride, and high ride light versions.  These uppers are available both billet and forged.  The two uppers that we are showcasing are  flat tops in both the right side and ambidextrous configuration which we used for the build on our Precision Rifle Raffle.  The high ride versions are basically the equivalent to adding a riser to the flat top.

IMG 0009 133x200 LAR Grizzly OPS 4 Upper ReceiverThe first thing I noticed about these uppers is that there is no place for a rear charging handle.  Considering that there is also no need for one, eliminating it altogether just makes sense.  Of course, you still need a groove in the upper to allow for the gas key to clear so you can install and remove your bolt carrier group (BCG).  LAR Grizzly’s answer for this was to add a thread to the groove and install a plug to keep the BCG from falling out when the upper and lower are separated.

IMG 0013b 200x133 LAR Grizzly OPS 4 Upper ReceiverFor these kind of side charging uppers, you need to install the charging handles in the BCG.  Looking back at the Y/M system, they have taken a standard BCG and modified them for use with handles.  This means there are teeth on the right side which were originally meant to work with a forward assist.  Since the charging handle itself becomes the forward assist, these teeth are not necessary.  Using a BCG without the teeth makes it more difficult for debris to get caught inside and therefore significantly decreases the chance of a malfunction.

IMG 00051 200x133 LAR Grizzly OPS 4 Upper Receiver IMG 00071 200x133 LAR Grizzly OPS 4 Upper Receiver IMG 0010 200x133 LAR Grizzly OPS 4 Upper Receiver

There are a couple of things to keep in mind about the left side of these upper receivers.  The ambi and left side models come with a modified bolt catch that must be used in place of the standard catch.  The reason for this is pretty simple: If you have a charging handle on the left side, it will strike the thumb lever portion of the bolt catch.  The right side version of this upper is milled out to allow the use of a standard bolt catch, however, there is not enough room to install devices such as Magpul’s B.A.D. Lever.  If you’re one of the growing number of people who like these devices, you will be happy to know that Phase 5 Tactical offers two different monolithic extended bolt releases which should work great on the OPS-4.  Their EBRv2-SC will work with both the left side and ambi units.

IMG 00041 280x186 LAR Grizzly OPS 4 Upper Receiver IMG 00081 280x186 LAR Grizzly OPS 4 Upper Receiver

In my honest opinion, I think the OPS-4 is a far better system than any other reciprocating side charging upper on the market.  I’d also like to point out that I paid $459.75 for the Y/M system while the LAR Grizzly OPS-4 can be had for $300.00 or $400.00 for their billet version.

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 LAR Grizzly OPS 4 Upper Receiver 702Shooter (162 Posts)

A devilishly handsome individual, 702Shooter is a sucker for adorable puppies, long walks on the beach, and cuddling after romantic interludes. In his spare time he runs this website and raises penguins in his back yard.

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{ 3 comments… read them below or add one }

bong1975 July 5, 2011 at 12:01 am

I was wondering if the ops 4 upper works with anykind of lower. Coz I have jd machine lower and I ordered a ops4 upper.

702 July 5, 2011 at 7:22 pm

Hey Bong1975,

There is a compatibility issue with one or two lowers but I do not recall which ones off hand. What I can tell you is that JD Machine does not ring a bell as being one of them.

Hunter14 July 25, 2011 at 8:09 am

I have a few questions about this complete upper made by largrizzly the OPS-4 Hunter. What kind of accuracy can be gotten from this upper? Is the bushmaster lower compatible? Would a Rock River Arms Predator Pursuit be a better buy?

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