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New impact block


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#1 SnowboardeR1298

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Posted 17 May 2013 - 11:22 AM

Just heard something recently from a local shop that kwa is manufacturing/about to release a new impact block that will allow for power stroking. He said it would only cost about $25 too. Definitely something I'd be interested in picking up soon if this is the case!

#2 SnowboardeR1298

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Posted 17 May 2013 - 11:39 AM

Excuse me, bolt catch. Sorry for the confusion.

#3 akiraspeedstar

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Posted 17 May 2013 - 12:14 PM

They already have and it's like $5-8. The new ones are premodified.

#4 BeachEMT

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Posted 17 May 2013 - 01:16 PM

If they wanted realistic construction, KWA would modify the impact block. On the RS, the detent and spring are in the receiver.

#5 SnowboardeR1298

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Posted 17 May 2013 - 01:18 PM

View Postakiraspeedstar, on 17 May 2013 - 12:14 PM, said:

They already have and it's like $5-8. The new ones are premodified.

Well I guess my source was wrong then. Sorry about that! Where can I pick that up at akira?

View Postakiraspeedstar, on 17 May 2013 - 12:14 PM, said:

They already have and it's like $5-8. The new ones are premodified.

Well I guess my source was wrong then. Sorry about that! Where can I pick that up at akira?

View Postakiraspeedstar, on 17 May 2013 - 12:14 PM, said:

They already have and it's like $5-8. The new ones are premodified.

Well I guess my source was wrong then. Sorry about that! Where can I pick that up at akira?

#6 SnowboardeR1298

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Posted 17 May 2013 - 01:24 PM

Sorry about posting that three times. My phone messed up.

#7 The Nutty Professor

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Posted 17 May 2013 - 01:35 PM

Yes I would like to know where to find it also? Ehobby?

#8 akiraspeedstar

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Posted 17 May 2013 - 02:02 PM

Well not an upgraded block, just that the new bolt stops are premodified. Sorry I forgot to mention that in my post, though if they're updating the impact block that would be interesting. Also get it straight from KWA at their proshop, you have to call though.

Edited by akiraspeedstar, 17 May 2013 - 02:02 PM.


#9 dos_Santos

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Posted 17 May 2013 - 02:05 PM

Just got one a few days ago.  Took me 5 minutes to do the mod since I didn't have to drill or shave.  Just bend.  Super easy.

#10 Migwl300

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Posted 19 May 2013 - 07:12 PM

so is this pre-modified bolt catch a drop in solution to "power stocking" i.e. if I get one will I have to do any modification to anything to enable power stocking?

#11 thatguyx

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Posted 19 May 2013 - 09:57 PM

The newer revised bolt catches part no. 16 come pre-drilled and slightly modified. They are almost drop-in in most cases to be able to power stroke. You may need to bend the arm a tiny bit more to achieve maximum height. However, the hole is bigger than detent plunger spring. I am using a cut down m17/m18c nozzle return spring, you can probably source a spring from a clicky pen or AEG selector plate spring.

I placed an order with KWAs pro shop Friday(5/17); good news is that they got a shipment recently with a ton if lm4 parts. Ie bolt catches piston return springs. But they have part no 16 & 16a. I assume the 16a is the newer part. I will report back when I get my package and reciew the packing list from them later this week.

#12 Migwl300

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Posted 20 May 2013 - 05:15 AM

So I need a spring, that's all.

#13 SnowboardeR1298

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Posted 20 May 2013 - 05:37 AM

thatguyx please do. I'm curious to know what the updates are.

#14 BootlegGucci

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Posted 23 May 2013 - 11:25 PM

I can confirm that KWA does have the new pre-drilled, already modified; bolt catch (part # 16). I placed my order over the phone directly with KWA on 5/14/13. I received them 5/20/13. I took some photos and was going to post them but this forum won't allow Flikr URL's for some reason.

When installed, and the bolt stop plunger spring (part # 73 if I'm not mistaken) placed in the pre-drilled hole, the bolt functions like it should. With the bolt locked to the rear, pulling on the charging handle will release the bolt allowing it to go forward into battery. However the arm still needs to be bent in order to better engage the magazine's disconnector because although my bolt functioned, it would not consistently lock back on an empty magazine. I found this to be true with an uncut/unmodified bolt stop plunger spring. If the spring was cut, as Gecko Actual mentioned in his YouTube video, it may engage the magazine disconnector a bit easier. Also material still needs to be removed (as Gecko Actual and Boobiem4h have done in their videos) to allow the bolt catch to rise higher, thus increasing the surface area which engages the bolt. My bolt carrier and bolt catch have quite a bit of wear due to the limited amount of material making contact. With continued use in this state I fear a bit of the carrier or bolt catch will eventually wear down or break off.

I've had material removed from my new bolt catch and a new spring added to replace the bolt stop plunger spring. When I get it back and install it I can report back with updated results.

Either way if you have an LM4 and you want to have it function like a real steel AR, you definitely should consider placing an order for the new bolt catch. Cost is $9.50.

Edited by BootlegGucci, 23 May 2013 - 11:37 PM.


#15 thatguyx

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Posted 25 May 2013 - 11:59 AM

Part no 16 confirmed again for pre-drilled hole. Still had to shave the shoulder and bend the arm a bit though.  No idea what part no 16a could be. Unless the guy I talked to last week was misinformed



#16 apilar

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Posted 26 May 2013 - 01:47 PM

They told me this part would be added to the website when it was in stock... i guess ill be calling.

Edit: seems they did add it... i feel dumb now

Edited by apilar, 26 May 2013 - 02:57 PM.





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