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1911 Mark Iv (4): Removing The Blow Back Unit.

Mark IV BBU Blow Back Unit Breach Block HELP ASAP

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#1 TonyAudenino

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Posted 23 May 2012 - 03:19 PM

I have been learning how to disasemble my 1911 and I have done everything but get the BBU (blow back unit) or as the main part is called in the manual, the breach block, out of the slide. I have been told that all you do is remove the screw on the bottom and it will slide forward and then up. I removed the screw and it will slide about 3 millimeters forward and 2 millimeters up but no more. I don't want to force it as I am afraid of breaking something but is that what I need to do?

If someone could make a video or show me one  or even just put a detailed step my step procedure on how to do this that would be wonderful. I tried asking the help desk but they just told me the can't give instructions on how to disassemble the guns.

Please reply ASAP

Thanks for you help,
Tony

#2 VictorNica

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Posted 23 May 2012 - 03:38 PM

Hi Tony, when trying to remove part #27, the breech, you can take a flat head screw driver and wedge it between the slide and legs of the piece so you can guide it out of place. Once you move each side you should be able to flip the slide over and the assembly will drop out. Be very careful because if you push too hard on the legs of the breech they will bend out of shape and you will not be able to use it. The breech does not always move freely so it may take some force to take it out.

#3 TonyAudenino

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Posted 23 May 2012 - 03:56 PM

Ok thank you for your reply I will try that right now and get back to you.

#4 TonyAudenino

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Posted 23 May 2012 - 03:59 PM

Ok I got it out. Good thing to. One of the cylinder springs (part 72) is all jacked up.
Thank you very much for your help on my issue,
Tony

#5 VictorNica

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Posted 23 May 2012 - 04:12 PM

You're welcome!

#6 doug.nash

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Posted 24 May 2012 - 09:18 AM

In the future, I would suggest not using something like a screw driver to prey it out. You would be better served by using a simple pair of angled tweezers. You can easily slip those into the two slots between the slide and the retaining arms of the air unit, and remove it.

Don't forget that the slides are made of extremely light, and relatively soft aluminum alloy. Also, those arms on the cylinder aren't that robust, as they are made from an average quality metal, at best. Too much torquing, and you're likely going to be replacing something unexpected.





Also tagged with one or more of these keywords: Mark IV, BBU, Blow Back Unit, Breach Block, HELP, ASAP

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