well i have a dedicated hahn block on backorder which was fine untill now, i thought i was gonna have to wait 6weeks for my 9mm upper but i just found a place that has them in stock so..... i need a magblock now, do i want the hahn top loading or bottom loading? i'd like to have last round hold open, help me out, i think i'm gonna order the upper tomorrow

I have a RRA upper and a dedicated Hahn (I asked John at Rainier which block to get, he suggested the dedicated).  Shot it yesterday for the first time.
The setup is VERY solid. Block fits a Mega lower perfectly with no slop, Bolt catch removal/re-install is the only 'smithing' to install. No worry about it dropping out the bottom either.  BHO worked every time, I suggest going with BHO.

Factory Colt mag worked excellent, with WWB from wally world, fits the Hahn MUCH better then I thought it would (again no slop, no rattle, mag catch locks the mag in with a precision feel). Had one stovepiped spent casing during the first 100 rounds, no other issues.

Factory mag is very solid, probably the most robust magazine I've ever owned for any firearm, thick metal, very sturdy.  But I still can't wait for Larry's mags at half the price.

From what I've read, the Dedicated or Bottom Hahns have BHO. Top may not. I can't seem to find Hahns web site at the moment to verify, this info comes from the Rainierarms site.

Please PM me where you found a 9mm upper in stock, I think I want a 2nd since they're so much fun and cheap to shoot!

Have fun!

+1 for the dedicated Hahn block.  The dedicated and bottom load are BHO, but the top load does not ahve the BHO.

scottMO

Quoted: I have a RRA upper and a dedicated Hahn (I asked John at Rainier which block to get, he suggested the dedicated).  Shot it yesterday for the first time. The setup is VERY solid. Block fits a Mega lower perfectly with no slop, Bolt catch removal/re-install is the only 'smithing' to install. No worry about it dropping out the bottom either.  BHO worked every time, I suggest going with BHO. Factory Colt mag worked excellent, with WWB from wally world, fits the Hahn MUCH better then I thought it would (again no slop, no rattle, mag catch locks the mag in with a precision feel). Had one stovepiped spent casing during the first 100 rounds, no other issues. Factory mag is very solid, probably the most robust magazine I've ever owned for any firearm, thick metal, very sturdy.  But I still can't wait for Larry's mags at half the price. From what I've read, the Dedicated or Bottom Hahns have BHO. Top may not. I can't seem to find Hahns web site at the moment to verify, this info comes from the Rainierarms site. Please PM me where you found a 9mm upper in stock, I think I want a 2nd since they're so much fun and cheap to shoot! Have fun!

i'll pm you after i order mine monday the dedicated may be out of the picture since it's out of stock, i'm not patient enough to have a fully assy 9mm AR with a missing backordered block, so, is anyone using the bottom loader? how is it?

The regular top load block has bolt hold open as long as you get the colt 9mm bolt catch to go along with it.  It does not have an actuator built in like the dedicated top load or the bottom load that works with the standard 5.56 bolt catch.  Brownells and others sell the colt 9mm bolt catches for $20 or $25 IIRC.

are there any serious draw backs to going with the bottom loading hahn vs the dedicated? i mean they're the same price

The two "potential" drawbacks to the bottom load block are:

1. you may need to adjust it slightly to get it to run properly, whereas both top loaders just drop in place

2. it is technically possible for the bottom loader to fall out as there is no positive stop holding it in.  The top loaders drop in and have a tab that prevents them from falling out the bottom.  You could have a bottom block pinned in place though (extra $).


It ultimately depends on what you want to do with your conversion.

With BHO:
bottom load is easiest to swap in and out
standard top load requires removal of 5.56 bolt catch and replace with 9mm bolt catch
dedicated top load requires removal and re-installation of 5.56 of bolt catch

Without BHO:
standard top load drops in and out with 5.56 bolt catch


If you want to use the same lower for 9mm and .223/5.56. then the easiest way is to use the bottom load or the standard top load and leave the 5.56 bolt catch installed

If you want a dedicated 9mm lower setup, then use the standard top load with a 9mm bolt catch or a dedicated top load with the 5.56 bolt catch.

No matter how you slice it, they all end up about the same price.  You can get the bottom load or dedicated top load block for the same price, or save about $30 by buying the standard top load, then spend the $30 you saved on a 9mm bolt catch.

Quoted: The two "potential" drawbacks to the bottom load block are: 1. you may need to adjust it slightly to get it to run properly, whereas both top loaders just drop in place 2. it is technically possible for the bottom loader to fall out as there is no positive stop holding it in.  The top loaders drop in and have a tab that prevents them from falling out the bottom.  You could have a bottom block pinned in place though (extra $). It ultimately depends on what you want to do with your conversion. With BHO: bottom load is easiest to swap in and out standard top load requires removal of 5.56 bolt catch and replace with 9mm bolt catch dedicated top load requires removal and re-installation of 5.56 of bolt catch Without BHO: standard top load drops in and out with 5.56 bolt catch If you want to use the same lower for 9mm and .223/5.56. then the easiest way is to use the bottom load or the standard top load and leave the 5.56 bolt catch installed If you want a dedicated 9mm lower setup, then use the standard top load with a 9mm bolt catch or a dedicated top load with the 5.56 bolt catch. No matter how you slice it, they all end up about the same price.  You can get the bottom load or dedicated top load block for the same price, or save about $30 by buying the standard top load, then spend the $30 you saved on a 9mm bolt catch.

hey thanks alot, that's a very good discription of how everything works

thanks again

oh my 9mm upper has shipped and is on it's way, i ended up getting a 9mm RRA midlength waaahoo, couldn't believe he had it in stock, he's got one CAR left, IM me if you wanna know who it is