Updating your Silencer/SBR Overall Length [OAL] Letter Generator

When you apply to make an SBR using the ATF Form 1 or the ATF eForm 1 you will be asked to know the overall length [OAL] of the SBR that you are to make.  But how can you know the overall length of the SBR if you are only able to make the SBR after you have received an approved tax stamp?  The ATF recommends only using an estimated overall length on your ATF Form 1 or the ATF eForm 1 and to update the ATF if the overall length of your SBR is different.  We created the "Updating your SBR Overall Length [OAL] Letter Generator" that is shown below to help you create a letter that you can send to the ATF informing them of the correct overall length of your SBR.  This can also be used if you manufactured a silencer using the ATF Form 1 or the ATF eForm 1.  Since the overall length that you submitted on your ATF Form 1 or ATF eForm 1 paperwork might have changed after you manufactured your silencer.